По следам http://forum.altlinux.org/index.php/topic,32354.msg227782.html#msg227782 Наверное, надо по команде "apt-repo rm all" комментировать всё, что не с комментария начинается, и не пустые строки.
apt-repo-1.3.10-alt1 -> sisyphus: Mon May 20 2019 Andrey Cherepanov <cas@altlinux> 1.3.10-alt1 - Add p9 branch. - Add --dry-run mode (ALT #35726). - Support to add archive of branch (ALT #30841). - Show and remove all non-commented and non-empty sources (ALT #30008). - Add key [<branch_name>] in addition to [updates] for branch source (ALT #32434). - Add arepo repository for added file: source. - Check task existance for apt-repo list task (ALT #34222). - Set new format only URL contains at least 3 parts. - Add new command `set` to remove all exising sources and add specified branch. - Ignore -devel* packages in task operation.
