Popos frozen

I’m using pop os on an external bootable hard drive and I was running some stuff on terminal when it froze. I tried restarting the gui from text terminal but now it’s only displaying the error message “failed to start journal service “
“Failed to start gnome display manager”
Kindly assist

Welcome!

In the text terminal, try to start the journald service, and read the error on screen.
A command like
service journald start
or
systemctl start journald
perhaps, if you are not root, put a sudo in front.

I have seen journald failing because the file /etc/machine-id was empty. In this case delete it and hope that the next boot will re-create a valid one.

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