On my Linux Mint 18.3 installation I had troubles with my locale setting which caused the generation of a folder that has invalid encoding in its name. 

I would now like to delete said folder but I can't figure out how I can do so. I tried using my file manager (Dolphin) as well as the terminal (`sudo rmdir <folder name>`) but both commands failed claiming that the given folder doesn't exist. 

However, it still gets displayed in the file manager and via the `ls` command. 

```
sudo rmdir Einf�hrung in die Biochemie/
rmdir: failed to remove 'Einf�hrung': No such file or directory
rmdir: failed to remove 'in': No such file or directory
rmdir: failed to remove 'die': No such file or directory
rmdir: failed to remove 'Biochemie/': No such file or directory

```

The name of the directory was copied from the output of `ls`.