No, thank you for pointing it out! But after setting it I am still bitten by this issue
It looks like "There is not enough space to download and install the selected items" BUG
It appears that
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Unity Hub wants to download files to /tmp that is for some reason limited to 1.9 GB (and apparently there is no method to override this download location and it is not mentioning why it actually fails)
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lsblk and KDE partition manager is not showing /tmp as being on a separate partition. And I selected to have / mount point on a single partition. Without splitting /tmp or /home or anything else to separate partitions. To avoid exactly this kind of problem.
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is maybe /tmp using swap partition? (afaik not but I am running out of ideas)
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is there some other limit of /tmp folder size? Even when not mounted on a separate partition? When I navigate with PsManFM-qt to /tmp it is showing that I have only 1.9 GB of free space. When I am in / or in /home it is showing >48 GB of free space (I made some further cleanup)