CentOS Linux 8 > cannot update anymore

Problem:
yum update
CentOS Linux 8 - AppStream 170 B/s | 38 B 00:00
Fehler: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist


Solution:
>> migrate to CentOS Stream8:
dnf --disablerepo '*' --enablerepo=extras swap centos-linux-repos centos-stream-repos
dnf distro-sync

>> after distro-sync there were some errors ... they could be solved, running command:
dnf distro-sync --nobest



##see also
- https://haydenjames.io/fix-error-failed-to-download-metadata-for-repo-appstream-centos-8/

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