An idea for old hard drives with platters:
Use this command: sudo e4defrag /
To be relaunched regularly. 
AI cooked up a not too dissimilar system specification to the real PC my Mother uses with Zorin 17 Core. A couple of differences though, she has 8GB DDR3 running at 1600MT/s and uses the integrated intel graphics with X11 because of some games running via WINE that refuse to run on Wayland, no discrete GPU necessary. storage is an old OCZ Trion 240GB SSD
it runs well but then she's not opening 50 odd browser tabs, while encoding video and typing documents in libreoffice all at once fortunately
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will do.
Before defragmenting on old hard disks with platters, it would also be a good idea to remove the dust (figuratively speaking).
A nice utility: www.bleachbit.org/download/linux
And as a reminder:
Zorin 17.3 --> Ubuntu 22.04 and Zorin 18 --> Ubuntu 24.04
BleachBit is in the software store, no need to download from 3rd party sites, where it could be questionable.
But, it's a very old version!
BleachBit is in the software store, no need to download from 3rd party sites, where it could be questionable.
I agree, but my link points to an official page of the publisher.
However, be careful of advertising.
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I was thinking this same thing.
In this case, Canonical is the third party supplier.
Which raises questions about the warnings of third party suppliers.
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Just posting to keep this topic open. Will visit my parents end of January. Will install Zorin Lite and report back with the results!
Should the Thread been closed, You can ask to reopen it.
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Strange it won't run. We replaced our old media server with a 2009 Dell Optiplex 760. It has a 3.0 GHz Core 2 Duo E8400 and 4GB of DDR2 RAM. Zorin 18 Pro is running on it just fine, although a little slow with anything graphics heavy. That's also with an Nvidia GT 710 Card using the Nouveau driver since the proprietary driver won't install.
Eventually we will double the RAM and install an AMD card, but it's totally usable now and serves our home media library perfectly.
Not being very savvy on the topic, I also find it very strange considering Zorin's required specs. But most people's answers here seem to confirm 4GB RAM and HDD is not enough for running apps on Core.
Agreed, in the modern Zorin OS 18 version of Core, you really need 8GB (16GB recommended) of RAM, and at least an SSD for storage speed. Nobody should be running it without a quad core CPU either, which is not a huge deal, 6-Core and 8-Core CPU's are standard these days.
If you do any production, coding, or heavy gaming workloads, you can jump those specs up to an 8-core CPU, 32GB of RAM. When the Zorin team release OS 18 Lite, you could try that instead, as past iterations of lite, used less requirements.