[Bug 530832] Re: vsftpd 2.2.2-3ubuntu4 fails to upgrade because no ftp group

[Jean-Baptiste Lallement]

John, this is the same error because the fix for this bug doesn't
correctly check if the default user/group 'ftp' exits.

To reproduce :
$ sudo adduser --system --group ftpd
$ sudo apt-get install vsftpd 

In postinst the following line is wrong 
if ! getent passwd | grep -q "^${_USERNAME}"
and should be at least
if ! getent passwd | grep -qw "^${_USERNAME}"
or simply: 
if ! getent passwd "${_USERNAME}"

Same thing for checking the existence of the group. BTW the problem
still exists in 10.10.

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vsftpd 2.2.2-3ubuntu4 fails to upgrade because no ftp group
https://bugs.launchpad.net/bugs/530832
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