Thank you so much for your help Croit. I followed all the the steps you suggested above but the start fails anyway. (see the attached pct start --debug log).
[Update]
I also tried to mount the 2 disks to see if there was my data but seem to be...
() sync_wait: 34 An error occurred in another process (expected sequence number 7)
__lxc_start: 2107 Failed to spawn container "102"
TASK ERROR: startup for container '102' failed
Dear friends I made a mistake while accidentally convert a LXC container to template.
Now I'm disperately trying to revert it but till now I couldn't.
I cloned it to a new CT (either linked and full copy mode) but I receive an error when I try to...