You have been subscribed to a public bug:
On Ubuntu, there is no way to change permission or owneship from a file
owned by root, the fields on Gnome stay disabled.
The expected would be to be able to change it, and have that famous
password prompt for security issues.
** Affects: nautilus (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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can't change permissions from a file owned by root without going on command line
https://bugs.launchpad.net/bugs/121029
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