Based on the link provided by tlhIngan, here is what I did (as root, sudo -s):
Here I was able to select (in my case) de_DE.UTF-8. No substancial changes to the user experience up to this point.
apt-get install console-setup
Here I was able to choose Other first, and then the classic German keyboard layout with dead keys for accent grave and acute.
[rant on]
Hey, English-speaking developers, do you have the slightest idea how painful it is work with a non-configured German keyboard? Almost every non-letter character is on another place, and some are really important! Thus, keyboard configuration is extremely important, expecially when ssh access is disfunctional!
[/rant off]
After this, there was no reaction from the รถ key anymore. Ok, there seems to be some change in effect, and it might help to reboot:
After rebooting, everything now seems to be fine.
Final remarks:
- It seems to be important to first do the
dpkg-reconfigure locales, and then apt-get install console-setup.
- The interactive configuration triggered by this installation can be repeated by entering
dpkg-reconfigure console-setup