Hey everyone,
yunohost has been great for the last months. Sadly, It has been redered useless for the past few days and I don’t know what to do anymore 
The only solved, related issue I found had problems with the french locale, my locale is en_US.UTF-8, so that does not seem to be the problem.
My YunoHost server
Hardware: VPS bought online
YunoHost version: x.x.x
I have access to my server : Through SSH & through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : yes
If yes, please explain: I did Change cipher compatibility configuration and use a seperate Redis database as a cache for matomo.
Description of my issue
I’m trying to update and install apps, but I always get an “500” Internal Server Error. The webadmin just spills this error for every app:
admin@host:~$ sudo yunohost app install castopod --debug
218 DEBUG initializing base actions map parser for cli
223 DEBUG loading actions map namespace 'yunohost'
238 DEBUG building parser...
251 DEBUG building parser took 0.013s
252 DEBUG acquiring lock...
271 DEBUG lock has been acquired
297 DEBUG loading python module yunohost.app took 0.026s
298 DEBUG processing action [10742.1]: yunohost.app.install with args={'app': 'castopod', 'label': None, 'args': None, 'no_remove_on_failure': False, 'force': False}
369 DEBUG Downloading...
606 DEBUG action [10742.1] executed in 0.308s
607 DEBUG lock has been released
607 ERROR Could not fetch sources files, is the URL correct?
admin@host:~$ sudo yunohost tools upgrade apps --debug
127 DEBUG initializing base actions map parser for cli
129 DEBUG loading actions map namespace 'yunohost'
131 DEBUG building parser...
139 DEBUG building parser took 0.008s
140 DEBUG acquiring lock...
153 DEBUG lock has been acquired
179 DEBUG loading python module yunohost.tools took 0.025s
179 DEBUG processing action [11741.1]: yunohost.tools.upgrade with args={'target': 'apps', 'apps': False, 'system': False}
827 DEBUG initializing ldap interface
1785 INFO The following apps will be upgraded: mautrix_whatsapp, netdata, element, my_webapp__2, grav, matomo
1785 INFO Now upgrading mautrix_whatsapp...
1828 DEBUG Downloading...
1998 WARNING unable to upgrade apps: Could not fetch sources files, is the URL correct?
1998 ERROR Some apps could not be upgraded
2002 DEBUG action [11741.1] executed in 1.822s
2002 DEBUG lock has been released
There is no log to share, or at least I did not find one in the webadmin under “tools/logs”
Best regards