After installing Ubuntu on a USB stick with the Ubuntu USB Startup Disk Creator (usb-creator-gtk) you might encounter an error such as the following:
stdin: I/O error stdin: error 0 /init: line 1: can't open /dev/sr0: No medium found
This is actually a bug with the software and isn’t anything you’ve done wrong. It seems to be a bug that’s effecting users running Karmic, Lucid, Maverick and Natty so it’s a pretty wide spread issue.
The best way I have found to get around this issue is to install and run unetbootin to create live USBs. If you’re using linux it should be found in the usual place you can install things.
sudo apt-get install unetbootin
sudo yum install unetbootin
Create a live USB:
To install a distro it’s pretty simple, either select it from the “Distribution” option and pick a distribution and version, UNetbootin will then actually download it and install it for you. Alternatively you can pick an Diskimage and browse for the ISO file you download (and would usually burn to a CD/DVD) and install from that. Select the USB Drive at the bottom and hit ok and it’ll install a bootloader, the system and you’ll be up and running in no time.
If you wanted a persistence install which allows you to save files, settings and installed programs you’ll have to do a little manual work as it currently doesn’t support that option.
Go to http://unetbootin.sourceforge.net/diskimg/ and download one of the files (128mb.zip, 256mb.zip, or 512mb.zip) corresponding to the amount of persistent space you want (make sure the size of the persistent disk image is smaller than the free space you have on your USB drive).
You’ll then need to edit the syslinux.cfg file that was created by UNetbootin in the root of the directory (just open it with a text editor) you should see something similar to the following:
menu label Default
append initrd=/ubninit file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash —
So on the line that starts “appen initrd=” you’ll want to add the option of “persistent”, it should then look like the following:
NOTE: WordPress changes my double dash at the end of the last line to a single long dash, this won’t work. It’s easiest just to add the final word before the double dash in the file, do not copy and paste this in to your file. If you do, you will get more errors.
menu label Default
append initrd=/ubninit file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash persistent —
I added this line to all that used the “file=/cdrom/preseed/ubuntu.seed” option, since that’s the image that’s being opened and it should then change all options on the bootloader that will load the ubuntu install.