restore my system
I faced a problem since I've run the commands in link to upgrade from ubuntu 18.04.6 LTS to 20.04. Unfortunately, I couldn't upgrade. Besides, running those commands broke other things from running like apt-get update and many other commands. For example, bu running 'sudo apt-get update', I get the following error:
Get:1 http://security.ubuntu.com/ubuntu hirsute-security InRelease [110 kB]
Hit:2 http://us.archive.ubuntu.com/ubuntu hirsute InRelease
Hit:3 http://dl.google.com/linux/chrome/deb stable InRelease
Get:4 http://us.archive.ubuntu.com/ubuntu hirsute-updates InRelease [115 kB]
Ign:5 https://esm.ubuntu.com/infra/ubuntu hirsute-infra-security InRelease
Ign:6 https://esm.ubuntu.com/infra/ubuntu hirsute-infra-updates InRelease
Err:7 https://esm.ubuntu.com/infra/ubuntu hirsute-infra-security Release
404 Not Found [IP: 91.189.88.182 443]
Err:8 https://esm.ubuntu.com/infra/ubuntu hirsute-infra-updates Release
404 Not Found [IP: 91.189.88.182 443]
Get:9 http://us.archive.ubuntu.com/ubuntu hirsute-backports InRelease [101 kB]
Reading package lists... Done
E: The repository 'https://esm.ubuntu.com/infra/ubuntu hirsute-infra-security Release' does not have a Release file.
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.
E: The repository 'https://esm.ubuntu.com/infra/ubuntu hirsute-infra-updates Release' does not have a Release file.
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.
Can I somehow restore the previous state of my system before running those commands so that my system works well like before?
I would be grateful for any help.
My guess was you've upgraded packages and are no longer running bionic (18.04) but have yet to boot - but in that case I'd still reboot & assess what you're actually running & how the upgrade went...
If Ubuntu (or flavor) Desktop you can fix by re-installing (no-format) which is what I'd likely do if I wasn't sure exactly what was done (I'm not sure!)
guiverc@d960-ubu2:/usr/share/sddm/themes/lubuntu$ rmadison update-manager-core
update-manager-core | 1:0.196.11 | trusty | all
update-manager-core | 1:0.196.25 | trusty-updates | all
update-manager-core | 1:16.04.3 | xenial | all
update-manager-core | 1:16.04.12 | xenial-security | all
update-manager-core | 1:16.04.17 | xenial-updates | all
update-manager-core | 1:18.04.11 | bionic | all
update-manager-core | 1:18.04.11.13 | bionic-updates | all
update-manager-core | 1:18.04.11.14 | bionic-proposed | all
update-manager-core | 1:20.04.9 | focal | all
update-manager-core | 1:20.04.10.9 | focal-updates | all
update-manager-core | 1:21.04.8 | hirsute | all
update-manager-core | 1:21.04.10 | hirsute-updates | all
update-manager-core | 1:21.04.11 | hirsute-proposed | all
update-manager-core | 1:21.10.4 | impish | all
update-manager-core | 1:21.10.5 | impish-updates | all
update-manager-core | 1:22.04.2 | jammy | all
If you apt-cache policy update-manager-core you should get update-manager-core | 1:18.04.11.13 | bionic-updates | allif your system is *bionic* but I suspect you'll get a package more likeupdate-manager-core | 1:21.04.8 | hirsute | all(which would match the *hirsute* lines you pasted in your question) but if you'd gone where you wanted (*focal* or 20.04) you'd seeupdate-manager-core | 1:20.04.10.9 | focal-updates | all.... ie. you're not running 18.04 at all I believe; the text file of your release doesn't match what you're actually running. I'd explore usingapt-cache, ubuntu-security-status` etc
Also note: In comments I asked you to run ubuntu-support-status which is the bionic command but you got
I get this : "ubuntu-support-status: command not found" and "ubuntu-security-status" runs
which is more confirmation that you're not running bionic with more packages upgraded. Instead your system ran the command which didn't yet exist in 2018; ie. the re-write called ubuntu-security-status.
Ubuntu 18.04 LTS reaches the end of it's standard support life in 2023-April; ie. 5 years from release. Any packages you have of that release will show that as the end of your security updates; though do note 'universe' packages had 3 yeas of support which has already ended for bionic. ubuntu-security-status (or if using 18.04 it's ubuntu-support-status) will give a glimpse of what packages you've likely got (it may not be accurate; but it's an easy way of getting a glimpse of packages that need fixing instead of checking them individually). It might be a lot of work I suspect; why re-installs are usually done, or restoration of our backups.
Much of what you've suggested will only fix your pasted detail on the screen; however it will stop your system getting updates & make it insecure in day(s) instead of month(s). The package I highlighted before shows you've already got hirsute packages installed (1:20.04.10.9); they won't receive any updates and bionic updates (1:18.04.11.13) as even if a newer 1:18.04.11.14 came out; 18.04.. is not > 20.04... so that package & all your upgraded hirsute packages will require you to manually fix. Your system isn't bionic or 18.04 anymore. Restore your backups (it's why we create/have them), re-install or re-install each package manually.
Summary
- restore your system backups
- re-install; which is easy for Desktops (I use it myself at least weekly in QA-testing & rather regularly in changing releases as focus changes to a different release (eg. currently jammy [22.04] & focal [20.04.4] are my primary focus) and my Ubuntu packages are re-installed without loss of any data files.
- manually fix as I've alluded to... this may be a huge job so I'd avoid it; re-install is much easier & cleaner.
This is written based on details you've provided; only two packages have been proven to be hirsute, but that's two of only two looked at - ie. a tiny sample size, but I suspect it's far more than that obviously. You can read the output of the commands I've given, explore using apt-cache policy suggested earlier for random packages & draw your own conclusion which will confirm or other my suspicions