How it is possible to install roundcube plugins that would persist throw upgrades? I mean if I composer install <plugin> in /usr/share/roundcube it always gives me error: Also, roundcube files ownership is root:root. I guess this is not normal...
I don't think that updates will remove plugins and the message you mentioned does not seem to be related to an update. In general, undefined error messages are mostly uncritical.
Hm, I'am getting familiar now with structure of RC... I see a bunch of symlinks. There is this: https://forum.howtoforge.com/threads/ispconfig-driver-for-roundcube-mark-as-junk-plugin.89087/ I guess it is no longer working as https://hsi.net.br/contrib/roundcube-markasjunk-ispconfig/ .php file is just blank.
Ok, and a last question: is there any known, confirmed to work "calendar" plugin for roundcube + ISPC?
