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I have a fresh install of xubuntu 14.04 with xrdp installed.

  • tab completion works when logged in via ssh
  • tab completion doesn't work when using any graphical shell (terminal, xterm, ...)
  • /usr/share/bash-completion/bash_completion is there
  • dot-sourcing that file doesn't help, too, in graphical shells
  • /bin/bash is the default shell and is also returned by echo $SHELL
  • the usual lines in .bashrc are there

those are the lines in .bashrc (for every user on the system - it's actually also in the skeleton file in /etc/skel/.bashrc):

if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi

What else could cause the tab completion to not work?

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Just found an answer here.

It's xfce what's blocking the use of tab.

edit ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml

find this line:
<property name="&lt;Super&gt;Tab" type="string" value="switch_window_key"/>

NOTE: there can be multiple lines containing name="&lt;Super&gt;Tab", so keep searching until you find the one also containing the value="switch_window_key".

and change it to:
<!--<property name="&lt;Super&gt;Tab" type="string" value="switch_window_key"/>-->

Relog.

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