This bug was fixed in the package shadow - 1:4.8.1-1ubuntu5.20.04.1
---------------
shadow (1:4.8.1-1ubuntu5.20.04.1) focal; urgency=medium
* Disallow purely numeric usernames. This includes hexadecimal
octal syntax. (LP: #1927078)
-- William 'jawn-smith' Wilson <william.wil...@canonical.com> Wed, 14
Jul 2021 17:08:18 -0500
** Changed in: shadow (Ubuntu Focal)
Status: Fix Committed => 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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