OK, your new version works perfect on my PRS-300. Here are the last lines of log. (I think that error it's only that it's trying to detect the SD card, which the PRS-300 doesn't have).
Devices possibly connected: PRS-300/505 Device Interface, Trying to open PRS-300/505 Device Interface ... Unable to mount card (Error code: 1) OK Main memory: '/media/READER/' Total space: (464928768L, 0, 0) -- calibre-mount-helper missing https://bugs.launchpad.net/bugs/561958 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs