I am trying to create a bootable Ubuntu 14.04 LTS OS on a 32 GB Flash drive. I have partitioned the flash drive, half in NTFS for storage, and half Ext2 as the primary partition to install Ubuntu. When I open Startup Disk Creator it only sees "Lexar USB Flash Drive (/dev/sdb)" and 0.0 B Free Space. I can erase the disk, but this will remove the partitions which is not what I want.
The reason I want to do this is that I use a HP notebook at home which is running Ubuntu 14.04 LTS, and an iMac running Mac OS X 10.9 at work. I want to be able to use the same software at work and home. The USB Ubuntu needs to be bootable from the iMac, and the data partiton needs to be available from this, and on my HP notebook.
Any help or suggestions would be much appreciated.