librealsense2-dkms error while installing: FATAL: Module videodev is in use for kernel 6.5.0-1003-oem

[MarioCavero]

Required Info
Operating System & Version	Ubuntu 22.04.4 LTS
Kernel Version (Linux Only)	6.5.0-1003-oem
Platform	Dell Latitude 7440
SDK Version	2.0?

Issue Description

I'm following the installation steps and I am encountering an error for librealsense2-dkms. The guide states:

Install the libraries (see section below if upgrading packages): sudo apt-get install librealsense2-dkms sudo apt-get install librealsense2-utils The above two lines will deploy librealsense2 udev rules, build and activate kernel modules, runtime library and executable demos and tools.

cat /etc/apt/sources.list.d/librealsense.list 
deb [signed-by=/etc/apt/keyrings/librealsense.pgp] https://librealsense.intel.com/Debian/apt-repo jammy main

 I do not have the log for when I did this the first time.

sudo apt-get install librealsense2-dkms Reading package lists... Done Building dependency tree... Done Reading state information... Done librealsense2-dkms is already the newest version (1.3.26-0ubuntu1). 0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded. 1 not fully installed or removed. Need to get 0 B/2,332 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] y

And:

sudo apt-get install librealsense2-utils Reading package lists... Done Building dependency tree... Done Reading state information... Done The following additional packages will be installed: libatk-bridge2.0-dev libatk1.0-dev libatspi2.0-dev libcairo2-dev libdatrie-dev libepoxy-dev libfribidi-dev libgdk-pixbuf-2.0-dev libglfw3 libgraphite2-dev libgtk-3-dev libharfbuzz-dev libharfbuzz-gobject0 libpango1.0-dev libpixman-1-dev librealsense2 librealsense2-gl librealsense2-udev-rules libthai-dev libxcb-render0-dev libxcb-shm0-dev libxcomposite-dev libxdamage-dev libxtst-dev pango1.0-tools wayland-protocols Suggested packages: libcairo2-doc libdatrie-doc libosmesa6 libgraphite2-utils libgtk-3-doc libpango1.0-doc libthai-doc graphicsmagick The following packages will be REMOVED: librealsense2-dkms The following NEW packages will be installed: libatk-bridge2.0-dev libatk1.0-dev libatspi2.0-dev libcairo2-dev libdatrie-dev libepoxy-dev libfribidi-dev libgdk-pixbuf-2.0-dev libglfw3 libgraphite2-dev libgtk-3-dev libharfbuzz-dev libharfbuzz-gobject0 libpango1.0-dev libpixman-1-dev librealsense2 librealsense2-gl librealsense2-udev-rules librealsense2-utils libthai-dev libxcb-render0-dev libxcb-shm0-dev libxcomposite-dev libxdamage-dev libxtst-dev pango1.0-tools wayland-protocols 0 upgraded, 27 newly installed, 1 to remove and 3 not upgraded. 1 not fully installed or removed. Need to get 0 B/15.3 MB of archives. After this operation, 48.1 MB of additional disk space will be used. Do you want to continue? [Y/n] y (Reading database ... 349442 files and directories currently installed.) Removing librealsense2-dkms (1.3.26-0ubuntu1) ... Reloading original modules into kernel...modprobe: FATAL: Module videodev is in use. dpkg: error processing package librealsense2-dkms (--remove): installed librealsense2-dkms package post-removal script subprocess returned error exit status 1 dpkg: too many errors, stopping Errors were encountered while processing: librealsense2-dkms Processing was halted because there were too many errors. E: Sub-process /usr/bin/dpkg returned an error code (1)

Trying:

> You can remove all RealSense related DKMS packages from your computer with the command below:
> 
> dpkg -l | grep "realsense" | cut -d " " -f 3 | xargs sudo dpkg --purge

dpkg -l | grep "realsense" | cut -d " " -f 3 | xargs sudo dpkg --purge (Reading database ... 349442 files and directories currently installed.) Removing librealsense2-dkms (1.3.26-0ubuntu1) ... Reloading original modules into kernel...modprobe: FATAL: Module videodev is in use. dpkg: error processing package librealsense2-dkms (--purge): installed librealsense2-dkms package post-removal script subprocess returned error exit status 1 Errors were encountered while processing: librealsense2-dkms

I have tried stopping videodev with modprobe unsuccesfully. No camera is connected. I first connected an intel real sense d405 (without installing anything), and disconnected it. 

dpkg -l librealsense2-dkms Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-==================-===============-============-========================================= rH librealsense2-dkms 1.3.26-0ubuntu1 all Modified kernel modules for librealsense2

And for any other kind of package I install (not realsense related), i get the same. 

In case this info can be useful:

sudo dkms status ipu6-drivers/0.0.0, 6.5.0-1003-oem, x86_64: installed mbedr_drv/1.0.69, 6.5.0-1003-oem, x86_64: installed mbedr_drv/1.0.69, 6.5.0-35-generic, x86_64: installed v4l2loopback/0.12.7, 6.5.0-1003-oem, x86_64: installed

 Thanks in advance!

 **EDIT/ADDITION:**

 In case it is useful, these are installed kernel images but I do not think I will be allowed/able to change them.

dpkg --list | grep linux-image rc linux-image-6.2.0-26-generic 6.2.0-26.26~22.04.1 amd64 Signed kernel image generic ii linux-image-6.5.0-1003-oem 6.5.0-1003.3 amd64 Signed kernel image oem ii linux-image-6.5.0-35-generic 6.5.0-35.35~22.04.1 amd64 Signed kernel image generic ii linux-image-generic-hwe-22.04 6.5.0.35.35~22.04.1 amd64 Generic Linux kernel image

I gues I am facing the same problem as in [here](https://github.com/IntelRealSense/librealsense/issues/12962#issue-2317719329), as I am also unable to remove it. I would like to avoid as much as possible a pc wipe... AFAIresearched, it seems it's the only way atm...

[MartyG-RealSense]

Hi @MarioCavero Another RealSense user at https://github.com/IntelRealSense/librealsense/issues/12885 who recently also experienced the FATAL: Module videodev is in use error resolved it with the following procedure:

1. Use lsmod to find what videodev was currently being used by. For example, their result from lsmod was videodev v4l2_async, v4l2_fwnode, ov13858

2. They then used the value at the end of the sentence to deactivate the module that was using videodev. For example, in their case the module was called ov13858 so they used it with the sudo modprobe -r module deactivation command.

sudo modprobe -r ov13858

They reported that afterwards the librealsense2-dkms package installed without any issue.

[MarioCavero]

Thanks for the reply @MartyG-RealSense . I think you mean #12885 . lsmod for videodev: videodev 364544 7 v4l2_async,v4l2_fwnode,hi556,videobuf2_v4l2,v4l2loopback,intel_ipu6_isys Which according to this solution, should be intel_ipu6_isys $ sudo modprobe -r intel_ipu6_isys Which now results in lsmod of:

videodev 364544 5 v4l2_async,v4l2_fwnode,hi556,v4l2loopback

I am afraid I cannot see any major changes. Logs below:

$ sudo apt-get install librealsense2-dkms
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
librealsense2-dkms is already the newest version (1.3.26-0ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 6 not upgraded.
1 not fully installed or removed.
Need to get 0 B/2,332 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y

This seems to do nothing, so I proceed with the following package from the guidelines, librealsense2-utils

$ sudo apt-get install librealsense2-utils
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  libatk-bridge2.0-dev libatk1.0-dev libatspi2.0-dev libcairo2-dev libdatrie-dev libepoxy-dev libfribidi-dev libgdk-pixbuf-2.0-dev libglfw3 libgraphite2-dev libgtk-3-dev libharfbuzz-dev
  libharfbuzz-gobject0 libpango1.0-dev libpixman-1-dev librealsense2 librealsense2-gl librealsense2-udev-rules libthai-dev libxcb-render0-dev libxcb-shm0-dev libxcomposite-dev libxdamage-dev
  libxtst-dev pango1.0-tools wayland-protocols
Suggested packages:
  libcairo2-doc libdatrie-doc libosmesa6 libgraphite2-utils libgtk-3-doc libpango1.0-doc libthai-doc graphicsmagick
The following packages will be REMOVED:
  librealsense2-dkms
The following NEW packages will be installed:
  libatk-bridge2.0-dev libatk1.0-dev libatspi2.0-dev libcairo2-dev libdatrie-dev libepoxy-dev libfribidi-dev libgdk-pixbuf-2.0-dev libglfw3 libgraphite2-dev libgtk-3-dev libharfbuzz-dev
  libharfbuzz-gobject0 libpango1.0-dev libpixman-1-dev librealsense2 librealsense2-gl librealsense2-udev-rules librealsense2-utils libthai-dev libxcb-render0-dev libxcb-shm0-dev libxcomposite-dev
  libxdamage-dev libxtst-dev pango1.0-tools wayland-protocols
0 upgraded, 27 newly installed, 1 to remove and 6 not upgraded.
1 not fully installed or removed.
Need to get 15.3 MB of archives.
After this operation, 48.1 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libatk1.0-dev amd64 2.36.0-3build1 [96.6 kB]
Get:2 https://librealsense.intel.com/Debian/apt-repo jammy/main amd64 librealsense2 amd64 2.55.1-0~realsense.12474 [2,656 kB]
Get:3 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libxtst-dev amd64 2:1.2.3-1build4 [16.3 kB]
Get:4 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libatspi2.0-dev amd64 2.44.0-3 [71.5 kB]
Get:5 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libatk-bridge2.0-dev amd64 2.38.0-3 [2,954 B]
Get:6 http://es.archive.ubuntu.com/ubuntu jammy-updates/main amd64 libpixman-1-dev amd64 0.40.0-1ubuntu0.22.04.1 [280 kB]
Get:7 https://librealsense.intel.com/Debian/apt-repo jammy/main amd64 librealsense2-gl amd64 2.55.1-0~realsense.12474 [744 kB]
Get:8 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libxcb-render0-dev amd64 1.14-3ubuntu3 [19.6 kB]
Get:9 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libxcb-shm0-dev amd64 1.14-3ubuntu3 [6,848 B]
Get:10 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libcairo2-dev amd64 1.16.0-5ubuntu2 [692 kB]
Get:11 https://librealsense.intel.com/Debian/apt-repo jammy/main amd64 librealsense2-udev-rules amd64 2.55.1-0~realsense.12474 [11.8 kB]
Get:12 https://librealsense.intel.com/Debian/apt-repo jammy/main amd64 librealsense2-utils amd64 2.55.1-0~realsense.12474 [8,348 kB]
Get:13 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libdatrie-dev amd64 0.2.13-2 [19.7 kB]
Get:14 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libepoxy-dev amd64 1.5.10-1 [132 kB]
Get:15 http://es.archive.ubuntu.com/ubuntu jammy-updates/main amd64 libfribidi-dev amd64 1.0.8-2ubuntu3.1 [64.8 kB]
Get:16 http://es.archive.ubuntu.com/ubuntu jammy-updates/main amd64 libgdk-pixbuf-2.0-dev amd64 2.42.8+dfsg-1ubuntu0.2 [47.8 kB]
Get:17 http://es.archive.ubuntu.com/ubuntu jammy/universe amd64 libglfw3 amd64 3.3.6-1 [83.2 kB] 
Get:18 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libgraphite2-dev amd64 1.3.14-1build2 [14.7 kB]
Get:19 http://es.archive.ubuntu.com/ubuntu jammy-updates/main amd64 libharfbuzz-gobject0 amd64 2.7.4-1ubuntu3.1 [26.0 kB]
Get:20 http://es.archive.ubuntu.com/ubuntu jammy-updates/main amd64 libharfbuzz-dev amd64 2.7.4-1ubuntu3.1 [553 kB]
Get:21 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libthai-dev amd64 0.1.29-1build1 [26.4 kB]
Get:22 http://es.archive.ubuntu.com/ubuntu jammy-updates/main amd64 pango1.0-tools amd64 1.50.6+ds-2ubuntu1 [45.8 kB]
Get:23 http://es.archive.ubuntu.com/ubuntu jammy-updates/main amd64 libpango1.0-dev amd64 1.50.6+ds-2ubuntu1 [154 kB]
Get:24 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libxcomposite-dev amd64 1:0.4.5-1build2 [9,326 B]
Get:25 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 libxdamage-dev amd64 1:1.1.5-2build2 [5,264 B]
Get:26 http://es.archive.ubuntu.com/ubuntu jammy/main amd64 wayland-protocols all 1.25-1 [70.6 kB]
Get:27 http://es.archive.ubuntu.com/ubuntu jammy-updates/main amd64 libgtk-3-dev amd64 3.24.33-1ubuntu2.1 [1,082 kB]
Fetched 15.3 MB in 2s (8,472 kB/s)                                                      
(Reading database ... 386979 files and directories currently installed.)
Removing librealsense2-dkms (1.3.26-0ubuntu1) ...
Reloading original modules into kernel...modprobe: FATAL: Module videodev is in use.
dpkg: error processing package librealsense2-dkms (--remove):
 installed librealsense2-dkms package post-removal script subprocess returned error exit status 1
dpkg: too many errors, stopping
Errors were encountered while processing:
 librealsense2-dkms
Processing was halted because there were too many errors.
E: Sub-process /usr/bin/dpkg returned an error code (1)

One thing I can see (maybe it is irrelevant, maybe not), the pc's camera (Cheese app, error as well as no resolution options, or using ffmpeg).

sudo modprobe -r v4l2loopback
sudo modprobe -r hi556
sudo modprobe -r v4l2_fwnode
sudo modprobe -r v4l2_async
sudo modprobe -r videodev
modprobe: FATAL: Module v4l2loopback is in use.
modprobe: FATAL: Module videodev is in use.

sudo systemctl stop v4l2-relayd

Now it seems the other two can be stopped.

sudo modprobe -r v4l2loopback
sudo modprobe -r videodev
lsmod | grep videodev

Now it seems it is installed! as a short log, I think : v4l2loopback and ipu6-drivers had something to do with it

Removing librealsense2-dkms (1.3.26-0ubuntu1) ...
Reloading original modules into kernel... complete
Current status:
ipu6-drivers/0.0.0, 6.5.0-1003-oem, x86_64: installed
ipu6-drivers/0.0.0, 6.5.0-41-generic, x86_64: installed
mbedr_drv/1.0.69, 6.5.0-1003-oem, x86_64: installed
mbedr_drv/1.0.69, 6.5.0-35-generic, x86_64: installed
mbedr_drv/1.0.69, 6.5.0-41-generic, x86_64: installed
v4l2loopback/0.12.7, 6.5.0-1003-oem, x86_64: installed
v4l2loopback/0.12.7, 6.5.0-41-generic, x86_64: installed
mod: videodev           
mod: uvcvideo            version: 1.1.1

Running rs-capture works as expected! rs-enumerate-devices as well. I loaded again the modules. modinfo uvcvideo | grep "version:" also outputs with realsense string. I will try to now install the ros2 realsense needed packages, hopefully it won't cause any errors. Unplugging the realsense camera and trying to open the regular camera with cheese or ffmpeg does not work, but that is a different issue for now. Thank you again for the (as always) fast and useful response, it gave me good hints. Feel free to close this issue!

[MartyG-RealSense]

Ah, thanks very much for pointing out the link's missing number. I have edited it above. :)

I'm pleased to hear that you were able to find a solution. As you suggest, I will close the issue. Thanks again!