I am also still experiencing this problem with 20.04.
$ xrandr --delmode DP-1 1024x768
X Error of failed request: BadAccess (attempt to access private resource
denied)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 19 (RRDeleteOutputMode)
Serial number of failed request: 32
Current serial number in output stream: 33
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https://bugs.launchpad.net/bugs/364091
Title:
xrandr error with delmode
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