Comment 2 for bug 1974072

Unfortunately, the problem has not yet been resolved. It seems to hinge on libortp15 vs libortp13 (the former supposedly replaces the latter but does not (cannot?) come with the same "provides"):

[2022-05-29T07:51:08+0200] root@desktop01:~# LANG=C apt install libbctoolbox1
Reading package lists... Done
[…]
The following additional packages will be installed:
  libbzrtp0 libmediastreamer-base10 libmediastreamer-voip10 libortp15
The following packages will be REMOVED:
  kde-full kde-standard kdenetwork kopete libortp13
The following NEW packages will be installed:
  libortp15
The following packages will be upgraded:
  libbctoolbox1 libbzrtp0 libmediastreamer-base10 libmediastreamer-voip10
4 upgraded, 1 newly installed, 5 to remove and 1 not upgraded.
Need to get 471 kB of archives.
After this operation, 15.4 MB disk space will be freed.
Do you want to continue? [Y/n] N
Abort.
[2022-05-29T07:51:49+0200] root@desktop01:~# LANG=C apt depends libortp13
libortp13
  Depends: libbctoolbox1 (>= 0.6.0)
  Depends: libbctoolbox1 (<< 0.7.0)
  Depends: libc6 (>= 2.27)
[2022-05-29T07:52:06+0200] root@desktop01:~# LANG=C apt depends kopete 2>/dev/null | grep libortp
  Depends: libortp13 (>= 1:1.0.1)
[2022-05-29T07:52:11+0200] root@desktop01:~# LANG=C apt depends kde-standard 2>/dev/null | grep kopete
  Depends: kopete (>= 4:17.08.3)
[2022-05-29T07:53:13+0200] root@desktop01:~# LANG=C apt depends libmediastreamer-base10
libmediastreamer-base10
  Depends: libbctoolbox1 (>= 4.4.0)
  Depends: libbctoolbox1 (<< 4.5.0)
  Depends: libc6 (>= 2.14)
  Depends: libortp15 (>= 1:4.4.0)
  Depends: libortp15 (<< 1:4.5.0)

[2022-05-29T07:57:26+0200] root@desktop01:~# LANG=C apt policy libbctoolbox1
libbctoolbox1:
  Installed: 0.6.0-2build3
  Candidate: 4.4.13-3build1~20.04.sav0
  Version table:
     4.4.13-3build1~20.04.sav0 500
        500 http://ppa.launchpad.net/savoury1/multimedia/ubuntu focal/main amd64 Packages
 *** 0.6.0-2build3 500
        500 http://de.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status
[2022-05-29T07:57:44+0200] root@desktop01:~#

Without rebuilding kde* (does not really sound like an option), the only alternative way forward (if libortp15 cannot be made "compatible" with libortp13) would likely be for libmediastreamer*10 to accept/depend on either libortp13 or libortp15. Not sure whether this can be accomplished "downstream" either.