Thank you, Marious. But sorry I wasn't clear enough: I have erased the previous name server address, and left only
the new one. Here is the entire /run/resolvconf/resolv.conf file:
> # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
> # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
> nameserver 127.0.0.2
and still, dig works fine (uses the 127.0.0.2 name server address, and succeeds in
resolving), but Jitsi fails. How can this be fixed?