OK, my third and last system is mostly up-to-date. On this one, an 'apt update && apt upgrade' followed by 'apt dist-upgrade' got me most of the way there. A few packages were removed (winehq-staging, okular, krita, dolphin, okular, among others), most of which I could reinstall after it.
But, right now I have
# apt dist-upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED:
digikam digikam-private-libs frei0r-plugins krita libmlt++-7-7 libmlt-7-7 libopencv-calib3d406 libopencv-contrib406
libopencv-core406t64 libopencv-dnn406t64 libopencv-features2d406 libopencv-flann406 libopencv-highgui406
libopencv-imgcodecs406t64 libopencv-imgproc406t64 libopencv-ml406t64 libopencv-objdetect406 libopencv-video406 libsynfig0a
libtbb12 melt7 shotcut synfig synfigstudio
The following NEW packages will be installed:
linux-headers-6.8.0-0.slh.2-aptosid-amd64 linux-image-6.8.0-0.slh.2-aptosid-amd64
The following packages have been kept back:
jackd2 libgssapi-krb5-2 libjack-jackd2-0 libjack-jackd2-0:i386 libjack-jackd2-dev libk5crypto3 libk5crypto3:i386
libkadm5clnt-mit12 libkadm5srv-mit12 libkf5kdelibs4support-data libkrb5-3 libkrb5support0 libkrb5support0:i386
The following packages will be upgraded:
libtbbbind-2-5 libtbbmalloc2 linux-headers-aptosid-amd64 linux-image-aptosid-amd64
4 upgraded, 2 newly installed, 24 to remove and 13 not upgraded.
Need to get 0 B/75.0 MB of archives.
After this operation, 212 MB of additional disk space will be used.
I did not see these removals on my other systems (although only on this one I have i386 packages, I think). Is that a problem on this system or just a matter of waiting for new versions to arrive?
Also, I cannot install winehq-staging anymore:
# apt install --install-recommends winehq-staging wine-staging
Reading package lists... Done
Building dependency tree... Done
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:
libcurl3t64-gnutls:i386 : Depends: libgssapi-krb5-2:i386 (>= 1.17) but it is not going to be installed
libnsl2:i386 : Depends: libtirpc3:i386 (>= 1.0.2)
libsane1:i386 : Depends: libgphoto2-6t64:i386 (>= 2.5.10) but it is not installable
wine-staging-i386:i386 : Depends: libgphoto2-6:i386 (>= 2.5.10)
Recommends: libcups2:i386
Recommends: libgssapi-krb5-2:i386 but it is not going to be installed
Recommends: libgtk-3-0:i386
Recommends: libkrb5-3:i386 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
I do not have any packages on hold... It seems to be related to i386 packages, some of which are not upgraded with the DU. Again, is it just a matter of waiting for updates? Any ideas or suggestions?