I had the same problem. I described it here - Jetson Orin NX stuck on boot after unmounting disk where Docker was moved
It helps me:
I restored this data from a backup (glory to backups!!!) on Snap:
/var/lib/snapd/*
/snap/*
/var/snap/*
/lib/snapd/*
/usr/lib/snapd/*
And from info in this article - https://jetsonhacks.com/2025/07/12/why-chromium-suddenly-broke-on-jetson-orin-and-how-to-bring-it-back/
Thank you @Kangalow very much!
You will also need to APPEND to the /boot/extlinux/extlinux.conf command line:
- apparmor=1 security=apparmor
And my Jetson finally launched Ubuntu!!!
Firefox and Sublime Text works.
Chromium and btop don’t works…
But I cannot reinstall snapd …