I did run an update of only one file and I did install another application. Rebooting and reverting back to the last snapshot did work as expected. The application has been removed and I could rerun the update again.
According to the Internet the next commands would stop all autozsys snapshots systemctl --user stop zsys-user-savestate.timer systemctl --user disable zsys-user-savestate.timer sudo mv /etc/apt/apt.conf.d/90_zsys_system_autosnapshot /etc/apt/apt.conf.d /90_zsys_system_autosnapshot_disabled but I still have collected a lot of autozsys snapshots, see next list rpool/USERDATA/bertadmin_9ykbc6@211015-proposed 2.08M - 177M - rpool/USERDATA/bertadmin_9ykbc6@autozsys_h1yy2t 92K - 176M - rpool/USERDATA/bertadmin_9ykbc6@211017-proposed 84K - 176M - rpool/USERDATA/bertadmin_g64ltk@autozsys_6g35l0 456K - 176M - rpool/USERDATA/bertadmin_g64ltk@autozsys_501rmb 520K - 176M - rpool/USERDATA/bertadmin_g64ltk@autozsys_jr1n7t 488K - 176M - rpool/USERDATA/bertadmin_g64ltk@autozsys_m29pbs 480K - 176M - rpool/USERDATA/bertadmin_g64ltk@autozsys_4h79sx 356K - 175M - rpool/USERDATA/root_9ykbc6@211015-proposed 72K - 812K - rpool/USERDATA/root_9ykbc6@211017-proposed 0B - 812K - Did I make an error or should I produce another bug-report? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1946808 Title: zfs fails reverting to a previous snapshot on reboot when selected on grub To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1946808/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs