I've traced the problem to udev. The ID_FS_* properties are missing from the udev device. udisks2 uses the ID_FS_TYPE property to determine the filesystem type.
** Package changed: udisks2 (Ubuntu) => udev (Ubuntu) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to udisks2 in Ubuntu. https://bugs.launchpad.net/bugs/1416794 Title: Can't mount exFAT on Ubuntu 14.10 Status in udev package in Ubuntu: New Bug description: I've installed the packages exfat-fuse and exfat-utils but I can't mount exFAT filesystems through udisks2. $ udisksctl mount --block-device /dev/sdb1 Object /org/freedesktop/UDisks2/block_devices/sdb1 is not a mountable filesystem. Mounting with $ sudo mount /dev/sdb1 ... works fine. It works fine on Ubuntu 14.04. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/udev/+bug/1416794/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
