Not able to install Ubuntu or Debian

[ZZZXXX0110]

I'm trying to create a Ubuntu container via brioche but I'm getting these during container creation:

cat: /etc/containername: Required key not available
-bash: line 1: /usr/bin/brioche-install: Required key not available
Input the password for user chronos:
cat: /etc/containername: Required key not available
New password: 
Retype new password: 
passwd: Authentication token manipulation error
passwd: password unchanged
Password confirmation does not match, try again
New password:

When I type in new password and then re-type the password, it says:

New password: 
Retype new password: 
passwd: Authentication token manipulation error
passwd: password unchanged
Password confirmation does not match, try again
New password:

And if I don't type in any password and just hit enter it says "Password not provided", and I'm not able to progress any further from here.

I tried Debian instead, and got exactly the same problem.

[MaxHeadrO0m]

change "cros_secure" to "cros_efi"/"cros_legacy" in grub.cfg create legacy image by using chromeos_install.sh --legacy_boot worked only with default kernel 5.4 NO LUCK with kernel 4.19 and 5.10

[ZZZXXX0110]

That is very unfortunate, I rely on kernel 4.19 to have an acceptable touchscreen experience on my SP6. Any idea what exactly was preventing this to work in kernel 4.19?

[MaxHeadrO0m]

Give r97 a chance. At least it looks good with kernel 5.15.