Can't claim USB device

[nseries100]

When I try start NUT sudo upsdrvctl start

I get this error Can't claim USB device [1cb0:0038]@0/0: could not detach kernel driver from interface 0: Operation not permitted Driver failed to start (exit status=1)

When I manually change permission and then try to start again, then its ok - but its not persistent. sudo chmod 0666 /dev/bus/usb/001/003

Any ideas? :)

Setup: UPS Legrand Keor 800

uname -a Linux raspberrypi 5.10.103-v7l+ #1529 SMP Tue Mar 8 12:24:00 GMT 2022 armv7l GNU/Linux

dpkg -s nut Package: nut Status: install ok installed Priority: optional Section: metapackages Installed-Size: 264 Maintainer: Arnaud Quette aquette@debian.org Architecture: all Version: 2.7.4-8 Depends: nut-client, nut-server Description: network UPS tools

/etc drwxr-xr-x 2 root nut 4096 Jun 22 10:28 nut

/etc/nut -rw-r--r-- 1 root root 1111 Jun 22 10:26 hosts.conf -rw-r----- 1 root nut 1543 Jun 22 09:23 nut.conf -rw-r----- 1 root nut 5700 Jun 22 09:03 ups.conf -rw-r----- 1 root nut 4599 Jul 22 2021 upsd.conf -rw-r----- 1 root nut 2225 Jun 22 10:21 upsd.users -rw-r----- 1 root nut 15424 Jun 22 10:28 upsmon.conf -rw-r----- 1 root nut 3887 Jun 1 2018 upssched.conf -rw-r--r-- 1 root root 1452 Jun 22 09:46 upsset.conf -rw-r--r-- 1 root root 3603 Jun 1 2018 upsstats.html -rw-r--r-- 1 root root 6446 Jun 1 2018 upsstats-single.html

/lib/udev/rules.d/ -rw-r--r-- 1 root root 11296 Jun 1 2018 62-nut-usbups.rules

/etc/nut/ups.conf [lups] driver = usbhid-ups port = auto vendorid = 1cb0 productid = 0038

[jimklimov]

Normally udev rules should get installed, to dynamically assign permissions to NUT-supported vendor/product IDs, so then the drivers can access them. Relies on consistent packaging to install the user accounts etc.

[dehnert]

FWIW, I had a similar error, and in my case the relevant UPS just seemed to be missing from /usr/lib/udev/rules.d/62-nut-usbups.rules.

Adding the missing lines to a file in /etc/ (and rebooting) seemed to work:

cat /etc/udev/rules.d/63-nut-usbups.rules
# For some reason, missing from 
# /usr/lib/udev/rules.d/62-nut-usbups.rules

# Add my UPS:
# Bus 001 Device 004: ID 09ae:3024 Tripp Lite AVR750U         
ATTR{idVendor}=="09ae", ATTR{idProduct}=="3024", MODE="664", GROUP="nut"

(Not sure if there's a subtle issue there.)

One imagines either the applicable line is missing for you (I don't see any 1cb0 in my copy) or /lib/ is the wrong path on your system, and either way probably adding something to /etc/ can work. (There might be a better solution of course.)