Im running an ubuntu server 16.04.5. System was working properly up to until a few days ago. Then yesterday I found out that I cannot login from the local keyboard. System behaves strangely....it takes the username but not the password. It looks like the enter key is stuck (its not) sending an empty password. After a few loops it resets asking for username. Login works via ssh and the problem also disappears once booting with previous kernel (4.4.0-151-genric). Any help??
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It's a known bug:
console login loop after entering username followed by RETURN
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1812095
Userspace break as a result of missing patch backport
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813873
Check your kernel version to see if you're affected. 4.15.0-43-generic is good, 4.15.0-44-generic and 4.15.0-45-generic are bad.
$ uname -r
4.15.0-45-generic
Nathaniel M. Beaver
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