Wrong APN for Tele2/Comviq SIM cards in Sweden
For Tele2/Comviq SIM cards in Sweden, when trying to enable mobile data the only APN available in the GUI is "internet.parlino.se" which does not work, "parlino" is some old brand name that is no longer used I think. To make mobile data work, it is necessary to manually edit a file in /etc/NetworkManager/system-connections/
to change to the correct APN which is "internet.tele2.se".
This seems to be the case for both Tele2 and Comviq SOM cards (Comviq is nowadays in practice the same as Tele2).
It seems like the reason for the "internet.parlino.se" APN appearing is that it is included in the mobile-broadband-provider-info package, for some reason it gets used in favor of the correct APN which also exists in the package. A solution could be to remove "parlino" to avoid it interfering with the correct APN.