how to find serial number on canon camera t3i

I have turned of auto-mounting in Ubuntu via the dconf Editor, by following these instructions I found, which did not help:

T18:35:35: Camera_get_config failed (-2): Bad parameters T18:35:35: Can not open camera: Power OK? If camera is auto-mounted as external disk storage, please unmount it and disable auto-mount. I get the following error message in Ekos: Obviously, this is no good and renders the RPI system useless as I can spend an hour or more just trying to get the Canon to connect. Like a mentioned above, about 1 in 20 attempts it connects and then all is well, but that's the exception. Most of the time Ekos does not make the connection, in which case I have to turn off the Canon, disconnect and 'stop' Ekos, then turn the Canon back on, and start Ekos again - HOPING this time it'll connect. Then once everything is running, turn the Canon on, wait 20 seconds, and THEN and ONLY then, press the 'start' button in Ekos. I find to get it to connect to the Canon at all, I need to boot everything first while keeping the Canon turned off.

However, Ekos only connects to my Canon T3i about 1 out of 20 attempts or ~ 5% of the time. Ekos connects to my mount and QHY guide camera 100% of the time, no problem. I connect via WiFi from a Windows 10 PC from which I run Kstars/Ekos.

I have the latest bleeding version of Indi installed on the RPI and use a profile in Indi Web Manager for my hardware: iOpron iEQ45 PRo, Canon DSLR and QHY CCD. I am running Ubuntu Mate 16.04 on a RPI 3B with a 128GB micro SD card.

How to find serial number on canon camera t3i