Working solution for snapshot mechanism under Linux?!

[Edt]

Thanks!
Since I also got in trouble recovering an urbackup Linux image I will walk away from urbackup, which is a pity. To me, it appears to be a Windows backup platform and probably working well.

Linux recovery with dm snapshot device - troubleshooting

Yesterday I had to recover an ubuntu 20.04 VM guest using urbackup and the urbackup recovery image. I was facing some problems after I updated the system including the kernel, so I post my recovery after recovery here… The picture attached shows that I ran into the initramfs prompt unable to find the boot root. After recovery I made a VM snapshot so I could reset the system to the state before the kernel update since I do not recommend to hassle around setting the boot root for GRUB and the ker…