Oops, I didn't read the error messages closely enough, sorry! (Also the mirror came back up right when I applied the Acquire::ForceIPv4 "true"; workaround, making me think my initial analysis was right. What a coincidence!)
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/1843554 Title: apt update is trying to use IPv6 for some reason, which does not work Status in apt package in Ubuntu: Invalid Bug description: Today I've discovered that I cannot use apt-get any more: apt update Hit:1 http://ppa.launchpad.net/mgedmin/ppa/ubuntu disco InRelease Ign:2 http://ddebs.ubuntu.com disco InRelease Ign:3 http://ddebs.ubuntu.com disco-updates InRelease Hit:4 http://ppa.launchpad.net/pov/ppa/ubuntu disco InRelease Hit:5 http://ddebs.ubuntu.com disco Release Hit:6 http://security.ubuntu.com/ubuntu disco-security InRelease Hit:7 http://ddebs.ubuntu.com disco-updates Release 0% [Connecting to lt.archive.ubuntu.com (2001:778:1::d)] and there it stalls for about 30 seconds, after which Err:10 http://lt.archive.ubuntu.com/ubuntu disco InRelease Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) Could not connect to lt.archive.ubuntu.com:80 (83.171.20.4), connection timed out Err:11 http://lt.archive.ubuntu.com/ubuntu disco-updates InRelease Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) Err:12 http://lt.archive.ubuntu.com/ubuntu disco-backports InRelease Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) Reading package lists... Done Building dependency tree Reading state information... Done 16 packages can be upgraded. Run 'apt list --upgradable' to see them. W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco/InRelease Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) Could not connect to lt.archive.ubuntu.com:80 (83.171.20.4), connection timed out W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco-updates/InRelease Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco-backports/InRelease Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) W: Some index files failed to download. They have been ignored, or old ones used instead. I don't know why it's trying to connect to my Ubuntu mirror over IPv6. There's no IPv6 in Lithuania (I'm exaggerating a bit, but my ISP -- the largest ISP in the country -- does not support IPv6). I've never had working IPv6 connectivity in my life. apt-get used to work before today. I've no idea what changed. ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: apt 1.8.1 ProcVersionSignature: Ubuntu 5.0.0-27.28-generic 5.0.21 Uname: Linux 5.0.0-27-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.10-0ubuntu27.1 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed Sep 11 11:46:28 2019 EcryptfsInUse: Yes InstallationDate: Installed on 2019-06-12 (90 days ago) InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) SourcePackage: apt UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1843554/+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