Ubuntu boot to initramfs

Problem:

Ubuntu cannot boot normally but drop to initramfs. The reason is some part of filesystem is broken, so we need to fix.

BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

Solution write the command of fsck /dev/sdax like the below and give Y if the console ask for fixing something:

(initramfs) fsck /dev/sda1

or

(initramfs) fsck /dev/sdaX

X specifies mounted disk part number.

If you don't want to manually press 'y' every time it asks for a fix, you can also run the command with the -y option.

(initramfs) fsck /dev/sdaX -y

ISSUE: Failed to start reboot.target: Connection timed out

When rebooting

Failed to start reboot.target: Connection timed out
See system logs and 'systemctl status reboot.target' for details.

Solution
$ sudo systemctl --force --force reboot

[Solved] Ubuntu log in GUI problem

Solve Ubuntu log in GUI problem

Problem definition:

I have ubuntu-desktop 16.04 to access it via GUI. Now I get the GUI login screen with my username (display name) but when i enter my password the screen just flicks and comes back to login screen ( doesnt give me any error). the same user works fine with same credentials in CLI.

strange thing is when i click on guest, it logs me in straight away and works fine.

Solution from stackflow:

down vote

This looks like the .Xauthority file is corrupted. Try this in a tty: sudo mv .Xauthority .Xauthority_backup Then restart lightdm and try to log in again: sudo service lightdm restart If that was not the cause, restore the file to its previous state: sudo mv .Xauthority_backup .Xauthority