I made bootable memory stick, installed Ubuntu 11.04. I need to mount /dev/sda into /mnt/sda to update fstab file - have to comment mounting nonexistent remote FS
/dev/sda is the whole disk. You will want to mount a partitions, rather than the whole disk, such as /dev/sda1 (but you need to check the correct name - that is just an example which may not be correct). Just add the appropriate line in /etc/fstab. Read: http://ubuntuforums.org/showthread....
We need to know how you created this flash. A pendrive install may make sda the real hard drive while a normal install to flash drive would make the usb sda. Any boot to the internal hard drive to chain over to the usb would be unknown.
First, you have to create a folder named /mnt/sda or better /mnt/sda1
Then use the mount command like this:
mount /dev/sda1 /mnt/sda1