I sure like seeing

    Expanded Security Maintenance for Applications is not enabled.
    
    0 updates can be applied immediately.
    
    108 additional security updates can be applied with ESM Apps.
    Learn more about enabling ESM Apps service at https://ubuntu.com/esm

> You do not have a valid subscription for this server. Please visit www.proxmox.com to get a list of available options.

every time I log in.

Ubuntu broke new ground when it came out but around the time they switched to the Gnome desktop, they stopped focusing on a great desktop experience and it was surpassed by other, better distributions. I'd recommend trying Linux Mint instead as it has all the greatness of Linux without the crap from Canonical (eg. SNAPs).

I haven't recommended Ubuntu to anyone for years but there are still people recommending it because it was great years ago and they don't seem to know it's now lagging other distributions.

Believe it or not, Ubuntu is not the only Linux distribution.

That’s if you run a OS version older than 5 years. You can still update to a newer Ubuntu version for free and get another 5 years if you pick an LTS version.

So disable it?