Public bug reported:

We use ldap authentication with mail addresses as usernames.
So usernames are not posix and some are > 32 chars but are working.

Some of them fire a bug :
When trying to log, it doesn't asks for password, it just wait some seconds 
then reset to ask username.

I can't clearly identify which regex fire the bug or not but this one does
"username.lastnamelastnamelastn...@domain.fr"

I reproduce it on ubuntu 18.04 and 20.04 daylibuild.

In auth.log, that line pops up when bug is started

"Mar  2 16:23:14 premier agetty[97945]: checkname failed: Operation not
permitted"

** Affects: pam (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1865517

Title:
  cannot log in with long username

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