This appears to be an issue with the patches to shadow for subuid/subgid
support. The --{add,del}-sub{uid,gid}s options don't operate on
/etc/passwd, only on /etc/sub{uid,gid}; but the code causes usermod to
fail if called for any non-local user.
Assuming there's no policy reason why non-local users are disallowed
from /etc/sub{uid,gid}, this is a simple fix. Cc:ing Serge Hallyn for
comment, as he originally pulled these patches in.
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https://bugs.launchpad.net/bugs/1475749
Title:
usermod --add-subuids fails for users not in /etc/passwd
Status in Canonical System Image:
New
Status in shadow package in Ubuntu:
New
Bug description:
currently we have need to utilize lxc on vivid+stable overlay which requires
adding subuser & subgroup ids.
unfortunately, usermod currently fails since phablet password is readonly
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