I searched "linux-image-5.10.0-15-amd64" in packages.debian.org and nothing turned up, though it does show up in synaptic as a debian package. My wifi card needs a kernel >5.16, so I installed kernel 5.18 from backports at which point apt-get did warn me that kernel 5.13 can be removed but said nothing about kernel 5.15
I have no non-debian repositories in sources.list (pasted below), is kernel 5.15 part of official debian repositories and why doesn't it show up as "no longer required"?
Additionally, there's been some strange things happening, when I start the laptop, if I select the default entry in grub it loads kernel 5.18 as desired, but starting kde is very slow, wifi doesn't work at all, and the laptop won't restart properly. However if I select advanced options in grub and manually select kernel 5.18 it does work (it's slow), and laptop will restart normally.
Edit: the weird behavior other than slow wifi has stopped after running update-grub2
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~# apt-get upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
linux-image-5.10.0-13-amd64
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
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~$ dpkg -s | grep linux-image-5
Package: linux-image-5.10.0-13-amd64
Replaces: linux-image-5.10.0-13-amd64-unsigned
Conflicts: linux-image-5.10.0-13-amd64-unsigned
Package: linux-image-5.10.0-15-amd64
Replaces: linux-image-5.10.0-15-amd64-unsigned
Conflicts: linux-image-5.10.0-15-amd64-unsigned
Package: linux-image-5.18.0-0.bpo.1-amd64
Replaces: linux-image-5.18.0-0.bpo.1-amd64-unsigned
Conflicts: linux-image-5.18.0-0.bpo.1-amd64-unsigned
Depends: linux-image-5.18.0-0.bpo.1-amd64 (= 5.18.2-1~bpo11+1)
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~$ uname -r
5.18.0-0.bpo.1-amd64
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# deb cdrom:[Debian GNU/Linux 11.3.0 _Bullseye_ - Official amd64 DVD Binary-1 20220326-11:23]/ bullseye contrib main
# manually hidden
# deb cdrom:[Debian GNU/Linux 11.3.0 _Bullseye_ - Official amd64 DVD Binary-1 20220326-11:23]/ bullseye contrib main
# Line commented out by installer because it failed to verify:
deb http://security.debian.org/debian-security bullseye-security main contrib non-free
# Line commented out by installer because it failed to verify:
deb-src http://security.debian.org/debian-security bullseye-security main contrib non-free
# manually added
deb http://deb.debian.org/debian/ bullseye main contrib non-free
deb-src http://deb.debian.org/debian/ bullseye main contrib non-free
# bullseye-updates, to get updates before a point release is made;
# see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports
# A network mirror was not selected during install. The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
deb http://deb.debian.org/debian/ bullseye-updates main contrib non-free
deb-src http://deb.debian.org/debian/ bullseye-updates main contrib non-free
# bullseye-backports, previously on backports.debian.org
# A network mirror was not selected during install. The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
deb http://deb.debian.org/debian/ bullseye-backports main contrib non-free
deb-src http://deb.debian.org/debian/ bullseye-backports main contrib non-free