[xubuntu] Trouble building Xubuntu 12.04 USB memory stick boot for USB install

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http://ubuntuforums.org – I am trying to install on a notebook with grumpy CD drive. It is presently loaded with Ubuntu 10.04, and I would like to install Xubuntu 12.04.2 x86 on it. My desktop machine runs Xubuntu 12.04 x64. I have clean formatted a 4GB SanDisk Cruzer, run through the "Startup Disk Creator", pointing that at the ISO I downloaded: ubuntu-12.04.2-desktop-i386.iso and selecting the SanDisk USB drive as target. The "Startup Disk Creator" says it completes successfully. Attempting to boot the notebook from the USB stick, however, comes up with an error that it can not read the drive. (Hardware)