This doesn't happen on a normal Trusty system, but yeah, there are
similar reports of this happening to people.  Must be some kind of
leftover stuff from upgrades. My system has  an upgrade chain going back
to Edgy (6.10), but I keep it tidy with aptitude and other tools.

You may have some cruft in your /etc/bash_completion.d that's causing
problems.  Either from packages that were removed but not purged, or
from obsolete conffiles (that the package owning them no longer
supplies, but didn't remove during upgrade).

bug 1000470 looks like it was due to acroread's tab completion, which is
blacklisted in Trusty.  Does your bash_completion.d have a different
name for acroread's adobe-supplied tab completion, that sneaks past the
blacklist and breaks your programmable completion?


And check for obsolete conffile with:
dpkg-query -f '${Conffiles}\n' -W | grep 'obsolete$'  | grep completion

I cooked up this perl script to go through the list and check if they match the 
stored md5sum from the package that provided them.  And to print out the name 
of the package owning each one.
dpkg-query -f '${Package}\n${Conffiles}\n' -W | 
perl -ane 'chomp; $pkg=$_ and next if !/^ /; $F[2] eq "obsolete" or next; -e 
$F[0] or print "no $F[0]\n" and next; ($localmd5)=split / /, `md5sum ${F[0]}`; 
print "$F[0] ". ($localmd5 eq $F[1] ? "un":"") . "modified in $pkg\n"; system 
"ls -l $F[0]";'

dpkg-query is just a fancy way to grep /var/lib/dpkg/status, but don't
tell anyone, because it's Better to use the documented API (dpkg-query),
instead of digging in the file yourself.  The lines recording obsolete
conffiles are removed by dpkg when the package owning them is purged,
upgraded, or reinstalled.  (not just reconfigured).

also see http://raphaelhertzog.com/2011/01/31/debian-cleanup-tip-1-get-
rid-of-useless-configuration-files/ including one of the comments about
obsolete conffiles leftover after package upgrades.


** Changed in: bash-completion (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1372286

Title:
  unwanted space after directory completion

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