Package: apt
Version: 3.3.3
Severity: important
X-Debbugs-Cc: [email protected], [email protected]

Several ppl using kernel 7.1.13 from `trixie-backports` reported on Debian
Forums that they could not `dist-upgrade` to the newest 7.2.x, see:
https://forums.debian.net/viewtopic.php?t=168439
https://forums.debian.net/viewtopic.php?p=849545#p849545

On Trixie's `apt` 3.0.3, `dist-upgrade` attempts to remove `linux-image-amd64`:
```
# apt list --installed 'linux*'
linux-base-7.1.13+deb13-amd64/now 7.1.13-1~bpo13+1 amd64 [installed,local]
linux-base-amd64/now 7.1.13-1~bpo13+1 amd64 [installed,upgradable to:
7.2.6-1~bpo13+1]
linux-base/stable,now 4.12.1 all [installed,automatic]
linux-binary-7.1.13+deb13-amd64/stable-backports,now 7.1.13-1~bpo13+1 amd64
[installed]
linux-cpupower/now 7.1.13-1~bpo13+1 amd64 [installed,upgradable to:
7.2.6-1~bpo13+1]
linux-headers-7.1.13+deb13-amd64/now 7.1.13-1~bpo13+1 amd64 [installed,local]
linux-headers-7.1.13+deb13-common/now 7.1.13-1~bpo13+1 all [installed,local]
linux-headers-amd64/now 7.1.13-1~bpo13+1 amd64 [installed,upgradable to:
7.2.6-1~bpo13+1]
linux-image-7.1.13+deb13-amd64/stable-backports,now 7.1.13-1~bpo13+1 amd64
[installed]
linux-image-amd64/now 7.1.13-1~bpo13+1 amd64 [installed,upgradable to:
7.2.6-1~bpo13+1]
linux-kbuild-7.1.13+deb13/now 7.1.13-1~bpo13+1 amd64 [installed,local]
linux-libc-dev/now 7.1.13-1~bpo13+1 all [installed,upgradable to:
7.2.6-1~bpo13+1]
linux-modules-7.1.13+deb13-amd64/now 7.1.13-1~bpo13+1 amd64 [installed,local]
linux-sysctl-defaults/stable,now 4.12.1 all [installed]
# apt dist-upgrade
Upgrading:
  libcpupower1  linux-base-amd64  linux-cpupower  linux-headers-amd64  linux-
libc-dev

Installing dependencies:
  linux-base-7.2.6+deb13-amd64  linux-headers-7.2.6+deb13-amd64  linux-
headers-7.2.6+deb13-common  linux-kbuild-7.2.6+deb13

REMOVING:
  linux-image-amd64

Summary:
  Upgrading: 5, Installing: 4, Removing: 1, Not Upgrading: 0
  Download size: 19.9 MB
  Space needed: 78.5 MB / 2,661 MB available

Continue? [Y/n] n
```

On 3.3.3, it just skips `linux-image-amd64`:
```
# apt dist-upgrade
Upgrading:
  libcpupower1  linux-cpupower  linux-libc-dev

Not upgrading:
  linux-base-amd64  linux-headers-amd64  linux-image-amd64

Summary:
  Upgrading: 3, Installing: 0, Removing: 0, Not Upgrading: 3
  Download size: 4,658 kB
  Freed space: 246 kB

Continue? [Y/n] n
```

This seems to be related to `linux-base` package that was upgraded from 4.12 to
4.17 in `trixie-backports` and that kernels 7.2.x *pre-depend* on:
```
# apt policy linux-base
linux-base:
  Installed: 4.12.1
  Candidate: 4.12.1
  Version table:
     4.17~bpo13+1 100
        100 http://deb.debian.org/debian trixie-backports/main amd64 Packages
 *** 4.12.1 500
        500 http://deb.debian.org/debian trixie/main amd64 Packages
        100 /var/lib/dpkg/status
# apt show linux-image-7.2.6+deb13-amd64
Package: linux-image-7.2.6+deb13-amd64
Version: 7.2.6-1~bpo13+1
Priority: optional
Section: kernel
Source: linux-signed-amd64 (7.2.6+1~bpo13+1)
Maintainer: Debian Kernel Team <[email protected]>
Installed-Size: 15.4 kB
Pre-Depends: linux-base (>= 4.17~)
```

Installing manually `linux-base` from `trixie-backports` resolves the issue and
after that `dist-upgrade` works as intended:
```
# apt install -t trixie-backports linux-base
Upgrading:
  linux-base  linux-sysctl-defaults

Summary:
  Upgrading: 2, Installing: 0, Removing: 0, Not Upgrading: 23
  Download size: 32.9 kB
  Space needed: 7,168 B / 3,031 MB available
```
(...)
```
# apt dist-upgrade
Upgrading:
  libcpupower1  linux-base-amd64  linux-cpupower  linux-headers-amd64  linux-
image-amd64  linux-libc-dev

Installing dependencies:
  linux-base-7.2.6+deb13-amd64    linux-headers-7.2.6+deb13-amd64   linux-
image-7.2.6+deb13-amd64  linux-modules-7.2.6+deb13-amd64
  linux-binary-7.2.6+deb13-amd64  linux-headers-7.2.6+deb13-common  linux-
kbuild-7.2.6+deb13

Suggested packages:
  debian-kernel-handbook  firmware-linux-free  linux-doc-7.2

Summary:
  Upgrading: 6, Installing: 7, Removing: 0, Not Upgrading: 0
  Download size: 193 MB
  Space needed: 326 MB / 3,031 MB available

Continue? [Y/n]
```

Configured sources during the above testing:
```
deb http://deb.debian.org/debian/ trixie non-free-firmware main contrib non-
free
deb-src http://deb.debian.org/debian/ trixie non-free-firmware main contrib
non-free

deb http://security.debian.org/debian-security/ trixie-security non-free-
firmware main contrib non-free
deb-src http://security.debian.org/debian-security/ trixie-security non-free-
firmware main contrib non-free

deb http://deb.debian.org/debian/ trixie-updates non-free-firmware main contrib
non-free
deb-src http://deb.debian.org/debian/ trixie-updates non-free-firmware main
contrib non-free

deb http://deb.debian.org/debian/ trixie-backports non-free-firmware non-free
contrib main
deb-src http://deb.debian.org/debian/ trixie-backports non-free-firmware non-
free contrib main
```
No priority pinning was configured.


-- Package-specific info:

-- (no /etc/apt/preferences present) --


-- (/etc/apt/preferences.d/java-11.pref present, but not submitted) --


-- (/etc/apt/preferences.d/kernel-backports.pref present, but not submitted) --


-- (/etc/apt/preferences.d/kernel-tbfive.pref present, but not submitted) --


-- (/etc/apt/preferences.d/revert.pref present, but not submitted) --


-- (/etc/apt/preferences.d/rust-backports.pref present, but not submitted) --


-- (/etc/apt/preferences.d/tuxedo.pref present, but not submitted) --


-- (/etc/apt/preferences.d/unstable.pref present, but not submitted) --


-- (/etc/apt/sources.list present, but not submitted) --


-- (/etc/apt/sources.list.d/backports-unstable-experimental.list present, but 
not submitted) --


-- (/etc/apt/sources.list.d/backports-unstable-experimental.list.save present, 
but not submitted) --


-- (/etc/apt/sources.list.d/kernel-tbfive.list present, but not submitted) --


-- (/etc/apt/sources.list.d/nvidia.list present, but not submitted) --


-- (/etc/apt/sources.list.d/nvidia.list.save present, but not submitted) --


-- (/etc/apt/sources.list.d/trixie-fixes.list present, but not submitted) --


-- (/etc/apt/sources.list.d/tuxedo.list present, but not submitted) --


-- (/etc/apt/sources.list.d/tuxedo.list.save present, but not submitted) --


-- (/etc/apt/sources.list.d/wine-ntsync.list present, but not submitted) --


-- (/etc/apt/sources.list.d/wine-ntsync.list.save present, but not submitted) --


-- System Information:
Debian Release: 13.7
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 
'stable'), (100, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 7.2.8+morgwai1-amd64 (SMP w/24 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_IE:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages apt depends on:
ii  adduser                 3.152
ii  base-passwd             3.6.7
ii  debian-archive-keyring  2025.1
ii  libapt-pkg7.0           3.0.3
ii  libc6                   2.41-12+deb13u4
ii  libgcc-s1               14.2.0-19
ii  libseccomp2             2.6.0-2
ii  libssl3t64              3.5.7-1~deb13u3
ii  libstdc++6              14.2.0-19
ii  libsystemd0             257.13-1~deb13u1
ii  sqv                     1.3.0-3+b2

Versions of packages apt recommends:
ii  ca-certificates  20250419

Versions of packages apt suggests:
pn  apt-doc         <none>
ii  dpkg-dev        1.22.22
ii  gnupg           2.4.7-21+deb13u1
ii  powermgmt-base  1.38
ii  synaptic        0.91.7

-- no debconf information

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