Replying to tom_yorados:
Revision:18360
OSM Server only supports OAuth2 authentication since July 2024. The first JOSM version supporting OAuth2 is r18650. So please upgrade JOSM to current tested version (r19128) and create the new authentication token.
Replying to tom_yorados:
I installed it via aptitude.
There seems to be no backports of JOSM available from Ubuntu and stable distro releases turn old relative quickly. You might want to switch to our own Ubuntu packages.
The JOSM build date seems strange (1970... )
That is a problem or intention of the package built by Ubuntu/Debian.