Please note that meta-debian supports two Debian versions: 8 (jessie) and 10 (buster).
"morty" branch targets on Debian 8 and "warrior" branch does 10.
I'm guessing you are trying to use the "warrior" branch.
Could you share the build conditions & target you tried
(Commands to setup meta layers, custom changes to local.conf, MACHINE value, bitbake target, etc.)
and the concrete build errors so that we can provide better hints?
I have not seen the related issue with both branches above.
Happy holidays!
Kazuhiro