Bug#1040796: Reports "release not available in the sources" when packages list is empty
Package: apt
Version: 2.6.1
Severity: normal
With the sources.list below this works:
```
"apt-get" "-o" "Debug::pkgDepCache::AutoInstall=false" "-o" "APT::Get::Show-Versions=false" "-u" "dist-upgrade" "--print-uris" "--yes" "-t" bookworm-security
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
```
while this gives an error:
```
# "apt-get" "-o" "Debug::pkgDepCache::AutoInstall=false" "-o" "APT::Get::Show-Versions=false" "-u" "dist-upgrade" "--print-uris" "--yes" "-t" bookworm-updates
Reading package lists... Done
E: The value 'bookworm-updates' is invalid for APT::Default-Release as such a release is not available in the sources
```
I assume that's because there's not yet a point release for bookworm and
hence the Packages file is empty. This currently trips up the munin
apt_all plugin on bookworm. I'm aware there's better ways to figure out missing
upgrades but wanted to report it nevertheless.
Cheers,
-- Guido
-- Package-specific info:
-- (no /etc/apt/preferences present) --
-- (/etc/apt/sources.list present) --
deb http://deb.debian.org/debian bookworm-updates main
deb http://deb.debian.org/debian bookworm main
deb http://deb.debian.org/debian-security/ bookworm-security main
-- System Information:
Debian Release: trixie/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: arm64
Kernel: Linux 6.1.0-9-amd64 (SMP w/12 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE=en_US: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 3.134
ii debian-archive-keyring 2023.3
ii gpgv 2.2.40-1.1
ii libapt-pkg6.0 2.6.1
ii libc6 2.36-9
ii libgcc-s1 12.2.0-14
ii libgnutls30 3.7.9-2
ii libseccomp2 2.5.4-1+b3
ii libstdc++6 12.2.0-14
ii libsystemd0 252.6-1
Versions of packages apt recommends:
ii ca-certificates 20230311
Versions of packages apt suggests:
pn apt-doc <none>
pn aptitude | synaptic | wajig <none>
ii dpkg-dev 1.21.22
ii gnupg 2.2.40-1.1
ii powermgmt-base 1.37
-- no debconf information
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