My system does not start after power went off (Ubuntu)
 

Can someone help me with this error?

Only if you know your configuration.
/dev/sda1 (at least) needs a fsck - use of encryption makes things more opaque. That was your choice at install.

hi
 

I started recovery mode and executed fsck to all partitions, its stuck at sda1 at 1.2% all night(1.2% non-contiguous...)


What does it mean? Should I still wait?

I usually run a live cd/usb linux session with gparted on it.

Then I boot the live session and run "Check" on improper unmounted drives that won't work anymore.
Be they flash drives or internal hard drives.

This fixes most issues for me.