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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?

Sanyam Jain
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    That command is provided by the package ubuntu-release-upgrader-core. Do you have that package installed? – user535733 Feb 21 '21 at 21:57

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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.

  • Note that this will not work if you wait for too long. I am currently facing an issue with 22.10, which reached its end of life in July 2023. The do-release-upgrade will fail (but not with an error) requesting the user to first do an update of the current system. However, an update will fail if the repository no longer has a release file (happens when end of life is reached). – rbaleksandar Jan 16 '24 at 14:08