This bug was fixed in the package shadow - 1:4.8.1-1ubuntu9
---------------
shadow (1:4.8.1-1ubuntu9) impish; urgency=medium
* Disallow purely numeric usernames. This includes hexadecimal and
octal syntax. (LP: #1927078)
-- William 'jawn-smith' Wilson <[email protected]> Thu, 17
Jun 2021 14:35:15 -0500
** Changed in: shadow (Ubuntu Impish)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1927078
Title:
Don't allow useradd to use fully numeric names
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