I created a live usb and i am trying to boot linux, but after it starts a large written ubuntu screen when starting appears i.e its boot screen but it do not start and continues as if it is still loading. i pressed Esc, and it says that

"(process:257) : Glib-warning:getpwu_idr():

failed due to unknown userid (0)
/init:line 7: can't open /dev/srr: No medium found

stdin:error 0"


plzzz..... i m really freaking out. help me.

Exactly how did you install ubuntu to the flash drive?

This line:makes me think it is looking for a CD to run from (specifically the /dev/srr portion) instead of the flash drive.

i want to add that this usb perfectly works and linux starts on my laptop but this error appears on my pc and ubuntu does not start

It may be that the PC (I assume you mean a desktop machine) is older and its bios does not provide for booting from a usb device. If so, check out the Plop boot manager.

Hi -

brucehinrichs and islandBilly are both correct:

1. The error message indicates that the PC is trying to boot from the CD (whereas you need it to boot from USB)

2. The first step is the BIOS:
a) You need to have a BIOS that supports USB boot
b) You need to configure the BIOS to boot from USB first, CD second, and hard drive last

3. Please do this:
a) Try booting again
b) Go into BIOS setup as soon as it tries to boot (usually "del")
c) Go into "boot options"
d) Set BIOS to boot from USB first
e) Save settings and exit

4. See if it tries to read the USB
See if you have any better luck after changing the BIOS

Good luck .. PSM

PS:
Did you ask Professor Dumbledore? He might have a charm that'll help us boot it from USB

I agree with all of the previous posters but want to add a thought:
The Desktop must already have its BIOS set up for USB booting, otherwise the boot process wouldn't get as far as looking for /dev/srr

What is /dev/srr when you boot it from the Laptop? Is that the USB drive?

Do you boot from GRUB? If you do, you could try hitting esc right after the BIOS post to get into the GRUB menu, then push E to edit the default boot entry. Try adding "map (hd0,0) (hd1,0)" and "map(hd1,0) hd(0,0)" to the top of the command list. What these will do is swap the USB drive and Hard drive over (hopfully, moving the USB to where it should be in the dev list when the kernel boots). Finaly push B to boot the modifyed GRUB entry. Note that anything you change like that is tempoary, and you'll need to change you GRUBs menu.lst to make it permianat.