My Linux Mint 16 (MATE) doesn't automount flash USB sticks anymore. A rapid search over the web shows me that I'm not the only one to face this problem. Till I find the right solution, I use the mount command from a terminal:
$ dmesg
...
[ 3246.981460] sd 25:0:0:0: [sdd] Write Protect is off [ 3246.981466] sd 25:0:0:0: [sdd] Mode Sense: 03 00 00 00 [ 3246.981715] sd 25:0:0:0: [sdd] No Caching mode page found [ 3246.981721] sd 25:0:0:0: [sdd] Assuming drive cache: write through [ 3246.983002] sd 25:0:0:0: [sdd] No Caching mode page found [ 3246.983008] sd 25:0:0:0: [sdd] Assuming drive cache: write through [ 3247.279559] sdd: sdd1 [ 3247.281017] sd 25:0:0:0: [sdd] No Caching mode page found [ 3247.281022] sd 25:0:0:0: [sdd] Assuming drive cache: write through [ 3247.281026] sd 25:0:0:0: [sdd] Attached SCSI removable disk
$ mkdir myUSBStick
$ sudo mount /dev/sdd1 myUSBStick
When you don't need to use the stick anymore:
$ sudo umount /dev/sdd1
Don't forget to run this commande before unplugging the stick from your computer. You will perhaps be asked your password one more time, depending on time elapsed from the initial mount command.