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I cannot copy and paste files from the file manager to Desktop on Ubuntu 20.04 LTS. Is there a way to fix this issue?
The file manager window you have open has a "Desktop" entry in the left navigation bar. Drop your file there and it will appear on the desktop.
Unfortunately you are not running a Mac or Windows.
What you can do in the file manager, is copy the file and then navigate to the folder //home//Desktop and paste it there.