I am using Ubuntu 20. Before encountering the issue, there was a power outage in the server room. After the power was restored, I booted up the system, but the following problem occurred: on the tty login interface, after entering the correct username and password, the system waits for a while, flashes briefly, and then returns to the login interface again. I have absolutely no idea how to troubleshoot this issue. Has anyone experienced the same problem?
Have you tried booting Recovery Mode?
https://www.ionos.com/digitalguide/server/configuration/ubuntu-wont-boot/
First step would be to do an fsck on the filesystem.
I would also do some basic checks like disk usage, permissions, user shell, system logs like journalctl etc.
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