Install Ubuntu 12.04 on a USB flash drive

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Http://mirrors.163.com/ubuntu-releases/precise/
Select i386 release version Alternate

After the download preparation with U disk installation, first try the Universal-USB-Installer-1.9.2.1 installation. After the installation is complete with simple start tester v4.0 test cannot start

Replace the ultraiso package and write the hard disk image to make it easy to start. Write it to the new boot zone. After syslinux is ready, it cannot be started.

Modify the syslinux/syslinuxfg file:
Comment out the default vesamenu32 statement, that is:
Set Default vesamenu32
Change
# Default vesamenu32

After modification, it can be started normally, but data cannot be read from the CD during operation.

Copy your ubuntu-12.04-alternate-i386.iso to the u disk root directory, and then restart, wait until the error that could not find the CD-ROM appears, press ATL + F2, switch to another console,

Run the following command:

Umount/dev/sdb4
Mount-T vfat/dev/sdb4/mnt/USB
CD/mnt/USB
Mount-T iso9660-o loop ubuntu-12.04-alternate-i386.iso/CDROM

The above/dev/sdb4 is my USB flash drive, and each machine may be different. Check it carefully. After executing the preceding command, you can switch back to ATL + F1, select Yes, and scan again. In this way, you can skip the error!

The last test was not performed because of Multiple tests. Therefore, I do not know whether the test is feasible.