When i do `apt-get update` i get the following error msgs:

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Err:12 http://de.mirror.devuan.org/merged ascii InRelease        
  Temporary failure resolving 'de.mirror.devuan.org'
Err:13 http://de.mirror.devuan.org/merged ascii-security
InRelease Temporary failure resolving 'de.mirror.devuan.org'
Err:14 http://de.mirror.devuan.org/merged ascii-updates
InRelease Temporary failure resolving 'de.mirror.devuan.org'
Err:15 http://packages.devuan.org/merged ascii
InRelease Temporary failure resolving 'packages.devuan.org'
Fetched 3020 B in 7s (423
B/s) Reading package lists... Done
W: Failed to fetch
http://de.mirror.devuan.org/merged/dists/ascii/InRelease  Temporary
failure resolving 'de.mirror.devuan.org' W: Failed to fetch
http://de.mirror.devuan.org/merged/dists/ascii-security/InRelease
Temporary failure resolving 'de.mirror.devuan.org' W: Failed to fetch
http://de.mirror.devuan.org/merged/dists/ascii-updates/InRelease
Temporary failure resolving 'de.mirror.devuan.org' W: Failed to fetch
http://packages.devuan.org/merged/dists/ascii/InRelease  Temporary
failure resolving 'packages.devuan.org' W: Some index files failed to
download. They have been ignored, or old ones used instead.
----

Thanks in advance for any pointer!