Ubuntu 18.04 not booting up: iwlwifi .. :BIOS contains WGDS but no WRDS

when I press Ctrl+Alt+F2 terminal appears and works fine but while Ubuntu login screen is booting up this issue appears

iwlwifi .. :BIOS contains WGDS but no WRDS

And my Ubuntu 18.04 is not booting up in the start. I haven't found solution to this problem. Anyone knows what to do?

See Ubuntu not booting due to iwlwifi error-BIOS contains WGDS but no WRDS

In a nutshell:

1. Boot into recovery mode

2. Choose Enable network, and wait for the process to complete.

3. Choose Drop to root shell prompt.

4. Reinstall the desktop manager packages with apt install ubuntu-desktop

5. Then reboot.

The boot process should progress as usual, and you should be able to log in.