“GNU GRUB version 1.97″beta 4 [ Minimal BASH-

Zarrelli il mercoledì, 22 Febbraio, 2012

Today I was updating an Ubuntu 9.04 virtual machine to 12.04. I went successfully to the 10.04 but after the 11.10 upgrade, at the reboot I had the following message:

“GNU GRUB version 1.97″beta 4 [ Minimal BASH-like line editing is supported.For the first word, TAB lists possible command completions. Anywhere else TAB lists possible device/file completions]

sh:grub>

Awkward! Couple of Google queries and I ran into help.ubuntu.com, where I found this pretty nice solution:

ls
set prefix=(hd0,1)/boot/grub
set root=(hd0,1)
set
ls /boot
insmod /boot/grub/linux.mod
linux /vmlinuz root=/dev/sda1
initrd /initrd.img
boot

Give this commands on Grub command line and keep in mind that I’m using sda1 (sda=hd0 | partition=1) and both /root and /boot are on the same partition.

As the system boots, login and issue the following command as root:

grub-install /dev/sda
update-grub

Then reboot. The system should boot up fine now!

Logarithmic penalty

Zarrelli il martedì, 9 Giugno, 2009 

The reason we don't want it is that there's a logarithmic penalty for
adding things to the initramfs, because not only does it have to be
loaded from disk, but it has to be decompressed, unpacked and cleaned up
afterwards.

Scott James Remnant

Ubuntu Developer Manager