How to restore Ubuntu boot after a crash?

Question

ubuntu

Ubuntu 17.10, after a reboot and apparently after the next update, crashes into this window:

At the same time, the second Windows 10 system boots normally.
The boot options window is displayed, but when choosing to boot Ubuntu, a black screen appears.
Reinstalling with system restore does not change anything.
What can be done besides a complete reinstall?

Answer 1

/dev/sdb6: INCONSISTENCY DETECTED; RUN fsck MANUALLY.
The root filesystem on /dev/sdb6 requires manually running fsck.

You are falling into a shell. run in itfsck -fy /dev/sdb6

Answer 2

Boot from the flash drive and restore grub via chroot.
Relevant instructions are in abundance, Google will tell you.
In fact, everything is simple.