This reverts commit
e139cf6039944d8a02ff433192c2040e020123a6.
Quoting from mail Message-ID: <
20201019075741.GC6791@server.c-otto.de>:
| we're done mirroring the grml data, everything is back to normal. Please
| re-enable our mirror.
|
| https://ftp.halifax.rwth-aachen.de/grml/
| http://ftp.halifax.rwth-aachen.de/grml/
| ftp://ftp.halifax.rwth-aachen.de/grml/
| rsync://ftp.halifax.rwth-aachen.de/grml/