Ir doesn’t matter how it happened. But users may readily check for erroneous URLs by running this command with a dummy version:
3400g:~ # zypper --releasever=XXXXXXXX --show-enabled-only
Warning: Enforced setting: $releasever=XXXXXXXX
# | Alias | Enabled | GPG Check | Priority | URI
---+-----------------------+---------+-----------+----------+----------------------------------------------------------------------
3 | repo-backports-update | Yes | ( p) Yes | 99 | http://download.opensuse.org/update/leap/XXXXXXXX/backports/
8 | repo-non-oss | Yes | (r ) Yes | 99 | http://download.opensuse.org/distribution/leap/XXXXXXXX/repo/non-oss/
9 | repo-oss | Yes | (r ) Yes | 99 | http://download.opensuse.org/distribution/leap/XXXXXXXX/repo/oss/
11 | repo-sle-update | Yes | ( p) Yes | 99 | http://download.opensuse.org/update/leap/XXXXXXXX/sle/
13 | repo-update | Yes | (r ) Yes | 99 | http://download.opensuse.org/update/leap/XXXXXXXX/oss
14 | repo-update-non-oss | Yes | ( p) Yes | 99 | http://download.opensuse.org/update/leap/XXXXXXXX/non-oss/
3400g:~ #
A quick and dirty upgrade wouldn’t work and resulted in a broken system: Question before upgrading to 15.5 - #7 by karlmistelberger
After rolling back and before trying again I ran the above command which revealed a broken URL. Fixed the URL double checked the list of repos and tried again: Question before upgrading to 15.5 - #12 by karlmistelberger > Sucess!