adambro
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adambro reacted to Joseph_ in multi-user issue: failed to enumberate device
Short answer: The old tmp behavior can be restored with a one-line sysctl change:
sudo sysctl fs.protected_regular=0 fs.protected_regular was changed to be non-zero in 20.04 which limits writes to only the owner (not even group) for files in world writable directories like /tmp
A detailed write up of the option and it's change can be found here https://unix.stackexchange.com/a/503169
