@Karel,

Hi there,

The error you’re seeing:

E: The repository 'http://archive.ubuntu.com/ubuntu vera Release' does not have a Release file.

…means your system is trying to upgrade to a non-existent Ubuntu version called “vera”, which isn’t a valid Ubuntu release.

It looks like you might be using Linux Mint, and “Vera” is actually the codename for Linux Mint 21.1, not Ubuntu. Mint is based on Ubuntu, but the upgrade process needs to follow Mint’s specific steps, not Ubuntu’s directly.

To fix it, open your terminal and check your software sources:

sudo nano /etc/apt/sources.list

Look for any lines that mention vera and change them back to:

jammy

Then update your package list:

sudo apt update

If you’re not comfortable with that, and your current Mint 21.3 system is running fine, it’s perfectly okay to stay on it. Mint 21.3 will receive updates until April 2027, so there’s no rush to upgrade.

I tried to upgrade as per the screen, selected option 3, and the process hangs with the following output:

Get:90 http://archive.ubuntu.com/ubuntu jammy-backports/multiverse amd64 c-n-f Metadata [116 B]
Reading package lists...
E: The repository 'http://archive.ubuntu.com/ubuntu vera Release' does not have a Release file.
Error - Return code: 100

How can I fix this? Or should I just stay on version 21.3?”

@Alex,

The error Return code: 100 usually indicates a problem with broken packages or repository issues.

Try the following commands to resolve it:

sudo apt update --fix-missing
sudo apt upgrade -y
sudo apt --fix-broken install
sudo apt clean && sudo apt update
mintupgrade

I’m trying to upgrade from version 21.3 on both an older PC and a laptop. However, after running mintupgrade, I keep encountering the following error on both systems:

Error - Return code: 100

The message suggests running:

apt update

I’ve tried this multiple times from a fresh terminal, but the issue persists.

Any help would be greatly appreciated!