I just installed roundcube on a raspberry pi4 (raspbian) from the package that they provide ( 1.4.3 ). This is also running pihole and uses lighttpd as the web server. Receiving email works fine. But when I click the Compose icon a linux file manager window opens up that shows my Desktop prompting me to save "blank.gif". I can either save it or cancel out of that window and then I'm back to the roundcube composing screen. Also, during installation I chose sqlite as the database in ~/roundcube. Also: I use the Brave Browser to access roundcube from another machine on my LAN.
I was looking in the sqlite datebase:system table:
roundcube-version 2016112200
Does that mean that I am running a 2016 version?
Why is this happening?
It means your database scheme is out of date, you're running the database scheme from Roundcube 1.3.x and you should update the scheme to the version you're currently using.