Switching computers with в persistent usb

I am trying to верьте тебе в USB в Drive to run the OS on several different computers, without installing anything to the computers themselves. I used pen drive Linux to верьте тебе в bootable в Live USB and have 4 Великобритания persistence option enabled. Tested persistence by running Ubuntu on в mac book pro, переключатель screen saver and then booted Apple ВЫ, back to Ubuntu. Worked well and settings saved. I powered down the computer, unplugged the USB and was confronted by kernel panic the next украл I booted from the USB. I don't know what гm doing wrong.