Ring cannot be upgraded to 20190319.4.a16a99f8~dfsg1-1 on Debian 10
└┌(#:~)┌- LANG=en_US apt install ring Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: ring : Depends: libqrencode3 (>= 3.2.0) but it is not installable E: Unable to correct problems, you have held broken packages. ┌┌(root@zaldaryn)┌(1507/pts/1)┌(04:10:03/21/19)┌- └┌(#:~)┌- LANG=en_US apt list --upgradable Listing... Done ring/unknown 20190319.4.a16a99f~dfsg1-1 all [upgradable from: 20190215.1.f152c98~ds1-1] N: There is 1 additional version. Please use the '-a' switch to see it
It looks like libqrencode3 has been removed from Debian 10/Testing looking at https://packages.debian.org/search?keywords=libqrencode3 . I am aware that you don't officially support it, but I think you may be interested in the issue regardless as Debian 10 is currently frozen and I think it shouldn't have bigger changes anymore before it gets released.