Welcome to Manjaro!
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Please read this:
How to provide good information
and post some more information so we can see what’s really going on. Now we know the symptom of the disease, but we need some more probing to know where the origin lies… -
An
inxi --admin --verbosity=7 --filter --no-host --width
would be the minimum required information… (Personally Identifiable Information like serial numbers and MAC addresses will be filtered out by the above command) -
Do you have any issues downloading other packages? (E.G. Manjaro updates)
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How did you install Unity Hub?
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Your profile info states you’re on Kernel 5.9 and that is EOL. Try upgrading to 5.4 LTS (Long term support) and 5.10 (LTS candidate) and reboot in each of those and try there.