fail to install ubuntu server 14.04 64bit LTS from USB drive

I created a bootable USB using Startup disk creator (in ubuntu desktop 12.04 32bit), from an iso image of Ubuntu server 14.04 64 bit, when I want to boot another computer using this usb drive, The computer boots up, the installation process ok, it gets through the selecting the language, then it shows me the error that it can't mount the cd-rom to continue the installation, I tried several times with others USB devices but it shows me the same error. How can I get this work ?

Solution 1:

This is how i got it to work.

When it gets the CD-ROM error, move the install USB stick from one port, to another USB port on your PC. Then retry.

This worked. I don't know why.

Not only that but I was reinstalling 14.04 later that night, and the CD-ROM error did not happen again. The 2nd install went without a hitch.

Yes it worked for me also.

Solution 2:

Problem is that the new image isn't meant to be used with unetbootin or any of the normal USB creators.

Just use dd like:

dd if=ubuntu-14.04.2-server-amd64.iso of=/dev/sdb bs=16M

(obviously, replace /dev/sdb with the path to your USB key, but don't use any partitions (i.e. don't use /dev/sdb1, /dev/sdb2, etc -- just the whole device)