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due to *possible* errors within /etc/bash_completion.d/git and /etc/bash_completion.d/grub, gdm3
cannot start the xsession.
After purging bash_completion logon works find.
The issue is could be within:
- bash_completion, which maybe is not that fail safe on script execution
- git and grub, because the scripts have errors
- gdm3, because it isn't that fail safe as well
- *any other suspect*
I have no idea what the root cause is, please try to find a solution.