This also affects 26.04 to 26.10 (ubuntu-release-upgrader 26.10.11,
python3-apt 3.1.0ubuntu1.1). Both remaining .list sources ended up as
.list.disabled (main.log, timestamps trimmed):
DEBUG Could not migrate deb [arch=amd64,arm64
signed-by=/usr/share/keyrings/claude-desktop-archive-keyring.asc]
https://downloads.claude.ai/claude-desktop/apt/stable stable main from
/etc/apt/sources.list.d/claude-desktop.list, disabling instead.
DEBUG Could not migrate deb [signed-by=/usr/share/keyrings/dbeaver.gpg.key]
https://dbeaver.io/debs/dbeaver-ce / from /etc/apt/sources.list.d/dbeaver.list,
disabling instead.
26.10's python3-apt 3.1.0ubuntu2 still rejects signed-by, so the next
upgrade will disable any such source again:
>>> from aptsources.sourceslist import SourceEntry
>>> SourceEntry("deb [signed-by=/k.gpg] https://example.com/apt stable
main").invalid
True
>>> SourceEntry("deb [arch=amd64] https://example.com/apt stable
main").invalid
False
For Claude Desktop, the package's postinst writes this one-line format
itself and recreates the file when it is missing, so "sudo dpkg-
reconfigure claude-desktop" restores it after the upgrade.
If the upgrade is aborted after this step, the .list files are lost
instead of disabled. That is bug 2171068.
_Drafted by Claude (Anthropic AI assistant)._
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https://bugs.launchpad.net/bugs/2167655
Title:
Third-party repos using [signed-by=] are left as .list.disabled after
upgrade; packages silently stop receiving security updates
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