Today I tried to upgrade my Ubuntu version from 17.04 to 18.04 following this tutorial, but this didn't work:

$ sudo apt-get update
Ign.:1 http://pl.archive.ubuntu.com/ubuntu bonic InRelease
Ign.:2 http://pl.archive.ubuntu.com/ubuntu bonic-updates InRelease
Ign.:3 http://pl.archive.ubuntu.com/ubuntu bonic-backports InRelease
Ign.:4 http://pl.archive.ubuntu.com/ubuntu bonic Release
Ign.:5 http://security.ubuntu.com/ubuntu bonic-security InRelease
Ign.:6 http://pl.archive.ubuntu.com/ubuntu bonic-updates Release

I followed all steps, but sudo apt-get update gives me these errors. How can I revert these changes to first update to Artful and then Bionic?

  • That unofficial tutorial leads you down an unwise and unsupported path. DO NOT use it unless you are expert at package management. That method of upgrade is appropriate for Debian...but not for Ubuntu. Since the upgrade windows for 17.04 and 17.10 have closed, and since many changes have been made since 17.04, the tested and supported solution is to backup your data and clean-install from an 18.04 or 18.10 LiveUSB. Note that the specific error you are asking about seems due to a typo you made - spelling matters.
    – user535733
    Oct 27, 2018 at 16:04

1 Answer 1


At first undo what ever you have done before such as

You spelled bionic as bonic so:


sudo sed -i 's/<whatever>/bonic/g' /etc/apt/sources.list

by running

sudo sed -i 's/bonic/<whatever>/g' /etc/apt/sources.list


sudo apt update
sudo apt upgrade


sudo apt dist-upgrade

Open the Software & Updates settings in System Settings.


Press Alt+F2 and type


Select the Updates tab

Set it to For long-term support versions if you are using 17.10.

Press Alt+F2 and type

update-manager -c

Update Manager should open up and tell you that Ubuntu 18.04 LTS is now available.

  • 1
    Note that Kasprian misspelled 'bionic', so the second undo 'sed' command will fail him.
    – user535733
    Oct 27, 2018 at 16:05
  • Thanx @user535733 for the observation.
    – Vijay
    Oct 27, 2018 at 16:53
  • Thank you guys. I was very nervous today, because my personal laptop went down and i have to send it to service(problem with LCD panel). As a result I had to configure my sisters laptop ASAP to end my project. Thank you all for help.
    – Kasprian
    Oct 27, 2018 at 19:05
  • Thanx Zanna
    – Vijay
    Oct 27, 2018 at 19:55

Not the answer you're looking for? Browse other questions tagged or ask your own question.