Boot Issue After Formatting and Changing Mounting Points

To boot into single user mode you edit the boot instructions for the GRUB menu entry you wish to boot and add the kernel parameter/option single. Brief instructions for how to do this are below.

Turn on laptop and wait when GRUB menu will appear. Select (highlight) the GRUB boot menu entry you wish to use. Use the first one entry in this case.

Press e to edit the GRUB boot commands for the selected boot menu entry.

Look near the bottom of the list of commands for lines similar to

linux /boot/vmlinuz-5.7.0 root=UUID=bc6f8146-1523-46a6-8b
6a-64b819ccf2b7 ro quiet splash initrd /boot/initrd.img-5.7.0

Change the line by removing quiet splash and by adding the kernel boot parameter single to the end of the line (it should look exactly like this: ro single).

For this example you would change:

6a-64b819ccf2b7 ro quiet splash

to

6a-64b819ccf2b7 ro single

Press either Ctrl+X or F10 to boot using these kernel options.

Note: These changes are not persistent. Any change to the kernel boot options made this way will only affect the next boot and only if you start that boot by pressing either Ctrl+X or F10 while still in GRUB edit mode.

Then run the system and see errors on the screen and provide a photo of the screen with errors or information the system shows.

Then you should hit Enter to go into maintenance mode and type in terminal.

journalctl -xb

and hit Enter.

It will show you all information from the boot start process to the end, I mean to the moment you hit Enter to go into maintenance mode. To quit viewing hit q.

Provide screenshots. Use arrows or PgUp PgDown to scroll text in the screen.

Then very important step is to show the fstab.

sudo cat /etc/fstab

Example: how fstab should look like:

UUID=89ef95ac-3c86-4b94-a37c-da8c72a148fa /               ext4    errors=remount-ro 0       1
# /boot was on /dev/sda6 during installation
UUID=8b4947b6-c0c9-4b1f-87ed-ef698609be22 /boot           ext4    defaults        0       2
# /boot/efi was on /dev/sda2 during installation
UUID=C8CA-DC0F  /boot/efi       vfat    umask=0077      0       1
# /home was on /dev/sda7 during installation
UUID=21f30bb7-2c7a-405f-bb16-b37901eeda09 /home           ext4    defaults        0       2
# swap was on /dev/sda5 during installation
UUID=c98dd990-02e1-4872-9de0-d00601e5aa7a none            swap    sw              0       0

Edit the /etc/default/grub

sudo nano /etc/default/grub

and change:

GRUB_CMDLINE_LINUX=""

to this:

GRUB_CMDLINE_LINUX="mount.timeout=300s"

ctrl+o saves, ctrl+x exits

Type

sudo grub2-mkconfig -o /boot/grub2/grub.cfg and restart.

To restart type:

 systemctl reboot

And hit Enter.

Then you can repeat all steps but instead of hitting Enter, hit Ctrl+d to run the system.

See will it load with default options.

The same effect you will achieve when you will hit Enter instead Ctrl+d and then type:

systemctl default 

and hit Enter.