[Bug 629234] Re: package vsftpd 2.2.2-3ubuntu6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Evan Broder]

You could potentially work around the regex misinterpretation issue by
using some more complex combinations of grep and awk and so forth, but
there's a better reason to not use getent | grep.

If /etc/nsswitch.conf is configured with a user or group database that
doesn't support enumerating users (Hesiod, for instance, and probably
LDAP under bad configurations), then the test will return false
*negatives* and then try to create a user that already exists.

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https://bugs.launchpad.net/bugs/629234

Title:
  package vsftpd 2.2.2-3ubuntu6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1