Hi all.
Today apt is acting strange.
It lists packages from "stable-backports" as upgrade candidates for
packages from "stable".
I don't use apt pinning for "stable-backports" or any custom apt
preference that would force backports installation.
I do use external repositories, but all of them are reputable sources
(Steam\Valve, WineHQ, Mozilla, Microsoft, etc.)
and "apt policy" output shows those candidates are not from these
external repos.
This can't be right.
A wild guess, is this some new behavior that stems from new apt sources
format?
$ cat /etc/apt/sources.list.d/debian.sources
Types: deb
URIs: https://deb.debian.org/debian
Suites: trixie trixie-updates trixie-proposed-updates trixie-backports
Components: main contrib non-free non-free-firmware
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
Types: deb
URIs: https://security.debian.org/debian-security
Suites: trixie-security
Components: main contrib non-free non-free-firmware
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
$ apt list --upgradable
chromium-common/proposed-updates,stable-security
142.0.7444.175-1~deb13u1 amd64 [upgradable from: 142.0.7444.134-1~deb13u1]
chromium-sandbox/proposed-updates,stable-security
142.0.7444.175-1~deb13u1 amd64 [upgradable from: 142.0.7444.134-1~deb13u1]
chromium/proposed-updates,stable-security 142.0.7444.175-1~deb13u1 amd64
[upgradable from: 142.0.7444.134-1~deb13u1]
code/stable 1.106.3-1764110892 amd64 [upgradable from: 1.103.0-1754517494]
curl/stable-backports 8.16.0-4~bpo13+1 amd64 [upgradable from:
8.14.1-2+deb13u1]
firefox-esr-l10n-ru/proposed-updates,proposed-updates,stable-security,stable-security
140.5.0esr-1~deb13u1 all [upgradable from: 140.3.0esr-1~deb13u1]
firefox-esr/proposed-updates,stable-security 140.5.0esr-1~deb13u1 amd64
[upgradable from: 140.3.0esr-1~deb13u1]
firefox/mozilla 145.0.2~build1 amd64 [upgradable from: 144.0.2~build1]
krita-data/proposed-updates,proposed-updates,stable-security,stable-security
1:5.2.9+dfsg-1+deb13u1 all [upgradable from: 1:5.2.9+dfsg-1]
krita/proposed-updates,stable-security 1:5.2.9+dfsg-1+deb13u1 amd64
[upgradable from: 1:5.2.9+dfsg-1+b1]
libbrlapi0.8/stable-backports 6.8-4~bpo13+1 amd64 [upgradable from:
6.7-3.1+deb13u2]
libcpupower1/stable-backports 6.17.8-1~bpo13+1 amd64 [upgradable from:
6.12.57-1]
libcurl3t64-gnutls/stable-backports 8.16.0-4~bpo13+1 amd64 [upgradable
from: 8.14.1-2+deb13u1]
libcurl3t64-gnutls/stable-backports 8.16.0-4~bpo13+1 i386 [upgradable
from: 8.14.1-2+deb13u1]
libcurl4t64/stable-backports 8.16.0-4~bpo13+1 amd64 [upgradable from:
8.14.1-2+deb13u1]
libcurl4t64/stable-backports 8.16.0-4~bpo13+1 i386 [upgradable from:
8.14.1-2+deb13u1]
libldb2/stable-backports 2:2.11.0+samba4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:2.11.0+samba4.22.6+dfsg-0+deb13u1]
libnss-winbind/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:4.22.6+dfsg-0+deb13u1]
libpam-winbind/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:4.22.6+dfsg-0+deb13u1]
libsmbclient0/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64 [upgradable
from: 2:4.22.6+dfsg-0+deb13u1]
libtalloc2/stable-backports 2:2.4.3+samba4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:2.4.3+samba4.22.6+dfsg-0+deb13u1]
libtdb1/stable-backports 2:1.4.14+samba4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:1.4.13+samba4.22.6+dfsg-0+deb13u1]
libtevent0t64/stable-backports 2:0.17.1+samba4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:0.16.2+samba4.22.6+dfsg-0+deb13u1]
libwbclient0/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64 [upgradable
from: 2:4.22.6+dfsg-0+deb13u1]
linux-cpupower/stable-backports 6.17.8-1~bpo13+1 amd64 [upgradable from:
6.12.57-1]
linux-headers-amd64/stable-backports 6.17.8-1~bpo13+1 amd64 [upgradable
from: 6.12.57-1]
linux-image-amd64/stable-backports 6.17.8-1~bpo13+1 amd64 [upgradable
from: 6.12.57-1]
linux-libc-dev/stable-backports,stable-backports 6.17.8-1~bpo13+1 all
[upgradable from: 6.12.57-1]
python3-brlapi/stable-backports 6.8-4~bpo13+1 amd64 [upgradable from:
6.7-3.1+deb13u2]
python3-ldb/stable-backports 2:2.11.0+samba4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:2.11.0+samba4.22.6+dfsg-0+deb13u1]
python3-samba/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64 [upgradable
from: 2:4.22.6+dfsg-0+deb13u1]
python3-talloc/stable-backports 2:2.4.3+samba4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:2.4.3+samba4.22.6+dfsg-0+deb13u1]
python3-tdb/stable-backports 2:1.4.14+samba4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:1.4.13+samba4.22.6+dfsg-0+deb13u1]
samba-ad-dc/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64 [upgradable
from: 2:4.22.6+dfsg-0+deb13u1]
samba-ad-provision/stable-backports,stable-backports
2:4.23.3+dfsg-1~bpo13+1 all [upgradable from: 2:4.22.6+dfsg-0+deb13u1]
samba-common-bin/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:4.22.6+dfsg-0+deb13u1]
samba-common/stable-backports,stable-backports 2:4.23.3+dfsg-1~bpo13+1
all [upgradable from: 2:4.22.6+dfsg-0+deb13u1]
samba-dsdb-modules/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:4.22.6+dfsg-0+deb13u1]
samba-libs/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64 [upgradable
from: 2:4.22.6+dfsg-0+deb13u1]
samba/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64 [upgradable from:
2:4.22.6+dfsg-0+deb13u1]
smbclient/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64 [upgradable
from: 2:4.22.6+dfsg-0+deb13u1]
tdb-tools/stable-backports 2:1.4.14+samba4.23.3+dfsg-1~bpo13+1 amd64
[upgradable from: 2:1.4.13+samba4.22.6+dfsg-0+deb13u1]
thunderbird-l10n-ru/proposed-updates,proposed-updates,stable-security,stable-security
1:140.5.0esr-1~deb13u1 all [upgradable from: 1:128.14.0esr-1~deb13u1]
thunderbird/proposed-updates,stable-security 1:140.5.0esr-1~deb13u1
amd64 [upgradable from: 1:128.14.0esr-1~deb13u1]
winbind/stable-backports 2:4.23.3+dfsg-1~bpo13+1 amd64 [upgradable from:
2:4.22.6+dfsg-0+deb13u1]
wine-devel-amd64/stable 10.20~trixie-1 amd64 [upgradable from:
10.15~trixie-1]
wine-devel-i386/stable 10.20~trixie-1 i386 [upgradable from: 10.15~trixie-1]
wine-devel/stable 10.20~trixie-1 amd64 [upgradable from: 10.15~trixie-1]
winehq-devel/stable 10.20~trixie-1 amd64 [upgradable from: 10.15~trixie-1]
xbrlapi/stable-backports 6.8-4~bpo13+1 amd64 [upgradable from:
6.7-3.1+deb13u2]
yt-dlp/stable-backports,stable-backports 2025.11.12-1~bpo13+1 all
[upgradable from: 2025.10.22-1~bpo13+1]
$ apt policy curl
curl:
Installed: 8.14.1-2+deb13u1
Candidate: 8.16.0-4~bpo13+1
Version table:
8.16.0-4~bpo13+1 100
100 https://deb.debian.org/debian trixie-backports/main amd64
Packages
*** 8.14.1-2+deb13u1 100
100 /var/lib/dpkg/status
8.14.1-2 500
500 https://deb.debian.org/debian trixie/main amd64 Packages
$ apt policy linux-headers-amd64
linux-headers-amd64:
Installed: 6.12.57-1
Candidate: 6.17.8-1~bpo13+1
Version table:
6.17.8-1~bpo13+1 100
100 https://deb.debian.org/debian trixie-backports/main amd64
Packages
*** 6.12.57-1 100
100 /var/lib/dpkg/status
6.12.48-1 500
500 https://security.debian.org/debian-security
trixie-security/main amd64 Packages
6.12.43-1 500
500 https://deb.debian.org/debian trixie/main amd64 Packages
$ apt policy samba
samba:
Installed: 2:4.22.6+dfsg-0+deb13u1
Candidate: 2:4.23.3+dfsg-1~bpo13+1
Version table:
2:4.23.3+dfsg-1~bpo13+1 100
100 https://deb.debian.org/debian trixie-backports/main amd64
Packages
*** 2:4.22.6+dfsg-0+deb13u1 100
100 /var/lib/dpkg/status
2:4.22.4+dfsg-1~deb13u1 500
500 https://deb.debian.org/debian trixie/main amd64 Packages
--
With kindest regards, Alexander.
Debian - The universal operating system
https://www.debian.org
