I can't mount the LG Optimus P700 (running the Android Jelly Bean OEM image) on my Ubuntu 12.10.
Other phones always have a selectable "Mass Storage" menu, but this one has no menu option for it when being connected to USB.
You can only select Media sync (MTP), USB tethering and "PC Software", which seems to be waiting for a custom software to answer when being selected.
If the device is connected, I can see it via lsusb, so the device is allowed in apparmor.
How can I manually mount the device?
Is it possible to mount such a device via mtp? How can I do that?
AirDroid: AirDroid is an App that allows uploading files via HTTP (even inside an isolated LAN) to your phone and has many other features. It is available free in the Play Store: https://play.google.com/store/apps/details?id=com.sand.airdroid&hl=en
Go-MTPFS: Go MTPFS is a FUSE filesystem using MTP (media transfer protocol) which is available on such phones while selecting "Connect to Media Suite" or similar. Installation instructions (also with a PPA): http://www.webupd8.org/2012/12/how-to-mount-android-40-ubuntu-go-mtpfs.html