The mirror of the Ubuntu archive which you use does not seem to be accessible any more and that is preventing your ability to upgrade to the next release of Ubuntu. I suggest switching mirrors of the Ubuntu archive and then updating all the packages for your existing release of Ubuntu and then trying the upgrade process again.
2022-01-16 19:48:51,830 DEBUG examining: 'deb http://kambing.ui.ac.id/ubuntu/ bionic main universe restricted multiverse' 2022-01-16 19:48:51,833 DEBUG verifySourcesListEntry: deb http://kambing.ui.ac.id/ubuntu/ focal main universe restricted multiverse 2022-01-16 19:48:51,833 DEBUG url_downloadable: http://kambing.ui.ac.id/ubuntu//dists/focal/Release 2022-01-16 19:48:51,833 DEBUG s='http' n='kambing.ui.ac.id' p='/ubuntu//dists/focal/Release' q='' f='' 2022-01-16 19:48:52,975 DEBUG error from httplib: '[Errno 104] Connection reset by peer' 2022-01-16 19:48:52,976 DEBUG entry '# deb http://kambing.ui.ac.id/ubuntu/ bionic main universe restricted multiverse' was disabled (no Release file) 2022-01-16 19:48:52,976 DEBUG examining: 'deb-src http://kambing.ui.ac.id/ubuntu/ bionic main universe restricted multiverse #Added by software-properties' 2022-01-16 19:48:52,979 DEBUG entry '# deb-src http://kambing.ui.ac.id/ubuntu/ bionic main universe restricted multiverse #Added by software-properties' was disabled (no Release file) 2022-01-16 19:53:33,330 DEBUG running doUpdate() (showErrors=True) ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1958071 Title: automatic update from ubuntu 18 (bionic beaver) to ubuntu 20 always fail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1958071/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
