Does a complete list of disallowed characters for user names exist, and can the restriction be bypassed?

[rokejulianlockhart]

@dirthsj

It is usually recommended to only use usernames

This isn’t the username field though, right?

       The options which apply to the chfn command are:

       -f, --full-name FULL_NAME
           Change the user's full name.

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Though I’m thankful anyway, @Herzenschein and @dirthsj,because

@Herzenschein

User/Group Name Syntax

and

@dirthsj

It is usually recommended to only use usernames that begin with a lower case letter or an underscore, followed by lowercase letters, digits, underscores, or dashes. They can end with a dollar sign

are both useful for

Why doesn't the Users KCM allow creating a user whose username contains capitals?

[Screenshot_20231008_023428] won’t allow me to type upper-case letters in the username field. Any idea why? It’s certainly possible, considering that my username is RokeJulianLockhart.