I'm getting an error in upgrading my ubuntu from 14.04 to newer versions, I probably deleted something while clearing up the space for new installation, hence i'm getting the following error:

sudo do-release-upgrade
sudo: unable to execute /usr/bin/do-release-upgrade: No such file or directory

Can someone tell me how to resolve this and continue with upgrade instructions?

  • 1
    That command is provided by the package ubuntu-release-upgrader-core. Do you have that package installed?
    – user535733
    Feb 21, 2021 at 21:57

1 Answer 1


Upgrading from 14.04 may yield some unresolvable errors as it left general support almost two years ago. That said, you may be able to upgrade by installing the update-manager-core package … assuming it's still available. Here's how:

  1. Back up your system
  2. Update apt:
    sudo apt update
  3. Install the update-manager-core package:
    sudo apt install update-manager-core
  4. Upgrade the OS to 16.04, which loses general support in six weeks:
    sudo do-release-upgrade

A faster, less error-riddled way would be to reinstall the OS from scratch. A lot has changed since 14.04, so starting with a fresh 20.04 (or newer) installation would save a lot of time, bandwidth, and hassle. Just be sure to make a decent backup of your important files beforehand.

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