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After I started the upgradation, The steps like downloading the new packages, installing the new packages went well without any error. After that step, My software update app got freezed and it remained freezed for like 2 hours almost. Then I force restarted my system with restart button. But after restart, it was Ubuntu 18.04. So I'm not sure if the upgradation was completed successfully or not. My files are safe afer the restart. But how can I be sure that everything is okay. Can anyone please help me about this matter?

My /etc/apt/sources.list looks like

deb http://archive.ubuntu.com/ubuntu bionic main universe restricted multiverse
deb-src http://archive.ubuntu.com/ubuntu bionic main universe restricted multiverse #Added by software-properties
deb http://security.ubuntu.com/ubuntu/ bionic-security main restricted multiverse universe
deb http://archive.ubuntu.com/ubuntu bionic-updates main restricted multiverse universe

Thank you.

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    Which method did you use to release-upgrade? do-release-upgrade, update-manager-core or other? I would login via terminal and sudo apt update to validate the sources are read correctly (watching the output), then possibly sudo apt dist-upgrade in hopes of continue, but this step would possibly vary on what method you used to release-upgrade.
    – guiverc
    May 13, 2019 at 7:03
  • I used software updater to check whether my system is up to date or not. Then it says that your system is up to date and asks if I want to upgrade my system from 16.04 to 18.04. I selected the upgrade option and followed the instruction to upgrade it and the aforementioned problem happened. The sources.list is of my present system (18.04).
    – Sayan Saha
    May 13, 2019 at 8:18
  • Your sources.list does not fill me with confidence, because it looks modified; there should be loads of instructions in the form of comments there. Regardless I'd do what I said (sudo apt update which is mostly to ensure the output looks correct), then sudo apt dist-upgrade in the hopes it would upgrade any packages not upgraded. Reset button I take as being a power-button (did the magic SysRq not work? or were they not tried? even if you don't remember the keystrokes, it's worth it to use another device to look up how to use them when necessary)
    – guiverc
    May 13, 2019 at 8:55
  • The result of sudo apt update is giving an error like W: GPG error: http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release: The following signatures were invalid: EXPKEYSIG 5A7D1D38BEB6D886 home:Horst3180 OBS Project <home:[email protected]> E: The repository 'http://download.opensuse.org/repositories/home:/Horst3180/xUbuntu_16.04 Release' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
    – Sayan Saha
    May 13, 2019 at 9:36
  • The result of sudo apt dist-upgrade went well without error. I'm also worried about the sources.list . I used the restart button ( there is a small button on cpu of my desktop, just bellow the power button to force restart the system). So what should I do at this point to be sure everything is okay?
    – Sayan Saha
    May 13, 2019 at 9:43

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