This appears to be a bug in python-apt. It fails to parse .sources files which contain a comment paragraph which is not connect to a source stanza (I think). I.e., this first scenario is fine:
root@mantic:~# cat /etc/apt/sources.list.d/ubuntu.sources # This comment is OK. Types: deb URIs: http://archive.ubuntu.com/ubuntu Suites: mantic mantic-updates Components: main universe Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg Types: deb URIs: http://security.ubuntu.com/ubuntu Suites: mantic-security Components: main universe Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg root@mantic:~# python3 Python 3.11.6 (main, Oct 8 2023, 05:06:43) [GCC 13.2.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> from aptsources.sourceslist import SourcesList >>> for e in SourcesList(deb822=True): ... print(str(e)) ... # This comment is OK. Types: deb URIs: http://archive.ubuntu.com/ubuntu Suites: mantic mantic-updates Components: main universe Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg Types: deb URIs: http://security.ubuntu.com/ubuntu Suites: mantic-security Components: main universe Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg >>> As opposed to this, which fails: root@mantic:~# cat /etc/apt/sources.list.d/ubuntu.sources # This comment is NOT OK. # This comment is OK. Types: deb URIs: http://archive.ubuntu.com/ubuntu Suites: mantic mantic-updates Components: main universe Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg Types: deb URIs: http://security.ubuntu.com/ubuntu Suites: mantic-security Components: main universe Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg root@mantic:~# python3 Python 3.11.6 (main, Oct 8 2023, 05:06:43) [GCC 13.2.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> from aptsources.sourceslist import SourcesList >>> for e in SourcesList(deb822=True): ... print(str(e)) ... WARNING:root:could not open file '/etc/apt/sources.list.d/ubuntu.sources': Unable to parse section data >>> -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to python-apt in Ubuntu. https://bugs.launchpad.net/bugs/2047447 Title: No valid source.list found while upgrading from mantic to noble Status in python-apt package in Ubuntu: New Status in ubuntu-release-upgrader package in Ubuntu: Confirmed Status in python-apt source package in Mantic: New Status in ubuntu-release-upgrader source package in Mantic: New Bug description: Checking package manager Reading package lists... Done Building dependency tree... Done Reading state information... Done Hit http://fr.archive.ubuntu.com/ubuntu mantic InRelease Hit http://fr.archive.ubuntu.com/ubuntu mantic-updates InRelease Hit http://fr.archive.ubuntu.com/ubuntu mantic-security InRelease Hit http://fr.archive.ubuntu.com/ubuntu mantic-backports InRelease Hit https://packages.gitlab.com/gitlab/gitlab-ce/ubuntu lunar InRelease Fetched 0 B in 0s (0 B/s) Reading package lists... Done Building dependency tree... Done Reading state information... Done Checking for installed snaps Calculating snap size requirements Updating repository information No valid sources.list entry found While scanning your repository information no entry about mantic could be found. An upgrade might not succeed. Do you want to continue anyway? Continue [yN] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/2047447/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
