[Nut-upsuser] Can't claim USB device

Tom Lane tgl at sss.pgh.pa.us
Wed Aug 7 19:25:38 UTC 2013

Lee Gold <leegold at operamail.com> writes:
> Ubuntu Server 12.04, Nut installed with sudo apt-get install nut
> ...
> Tried this and got error message:
> Can't claim USB device [0764:0501]: could not detach kernel driver from
> interface 0: Operation not permitted

Did you reboot after installing the nut package?  Just a couple days ago
I connected up a USB UPS to a Red Hat machine, and then installed nut,
and found that the kernel had already grabbed the device.  Apparently
nut's hotplug definition files have to be in place at boot time to prevent
that.  Maybe things work differently on Ubuntu, but it's worth a try.

			regards, tom lane

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