You have been subscribed to a public bug:
After upgrading from Ubuntu 18.04 LTS to 18.04.1 LTS, I get errors
whenever I attempt to tab-complete anything from an interactive bash
prompt.
Tab-completing nothing gives me:
-bash: _xspecs[$cmd]: unbound variable
Tab-completing an existing filename gives me:
-bash: !ref: unbound variable
I've partially narrowed down the cause to me putting `set -o nounset` in
my `.bashrc` file, and something in `/usr/share/bash-completion` is
triggering these unbound variable errors. (That is, the errors go away
if I remove `set -o nounset` or if I make `/usr/share/bash-
completion/bash_completion` exit immediately.)
** Affects: bash (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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bash completions in /usr/share/bash-completion generate unbound variable errors
https://bugs.launchpad.net/bugs/1813090
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