> Sorry for not getting back earlier.

No worries.  Glad you got your systems sorted.

Not closing this bug, because your problem wasn't this bug after all..
>.<  I still want to leave this bug here for the purpose I editted the
OP to.

> Nonetheless I'd like to know if there is way to detect if
bash_completion is already sourced other than checking the
BASH_COMPLETION variable.

Ubuntu 14.04 and git HEAD (of bash-completion) both set 
BASH_COMPLETION_COMPAT_DIR as a read-only shell variable.
The problematically-located /etc/profile.d/bash_completion.sh checks that.  
(problematic because bash_completion needs to be sourced for every shell, not 
just login shells.)

Until COMPAT_DIR support goes away  (the /etc/bash_completion.d/ files
that are sourced at startup, instead of dynamically when needed), this
will be fairly foolproof, unless it was introduced too recently to be
present on your old systems.

Fairly completely foolproof would be to check if there is a completion
loaded for ls.

if ! complete -p ls &> /dev/null;
  source something
fi

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

Title:
  unwanted space after directory completion (probably old cruft after
  upgrades)

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