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By comparing my during the installation modified ~/.bashrc with /etc/skel/.bashrc using diff I found that I accidentally inserted some characters behind a grep alias in the ~/.bashrc:

That's how it was, which caused the autocompletion error:

alias grep='grep --color=auto'accidentally inserted characters

That's how it now is and should be:

alias grep='grep --color=auto'

Apparently the autocompletion for rosrun somehow uses this alias which caused the failure...