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Black screen beteen GRUB and login screen
December 30, 2018
Edited: June 12, 2020
November 24, 2022
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To see what is happening during the 20 to 30 seconds use:
sudo -H gedit /etc/default/grub
Find the line that starts with:
and change it to:
Leave the rest of the line as is.
Now save the file and exit
Now when you reboot you will see the messages scroll by as the kernel boots up. If it gets stuck on one message for more than a second note it and add it to your question.
For a detailed time break down of your boot use:
The longest running boot commands are listed first. Use Q to exit the command.
Systemd log messages
After completing above steps this error is revealed during boot up:
WARNING: Failed to connect to lvmetad. Falling back to device scanning.
Arch Linux references this error here.
Unix & Linux describes LVM setup errors here.