I have a virtual machine with Ubuntu 14.04 in it. I recently built and installed linux-3.14.5 kernel on it, and tried to boot into it, but it drops me to BusyBox v1.21.1 built-in shell.
Here's what I did:
wget https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.14.5.tar.xz
mkdir ~/linux
mv linux-3.14.5.tar.xz ~/linux
tar -xJf linux-3.14.5.tar.xz
mkdir linux-3.14.5
cd linux-3.14.5_src/
make defconfig O=../linux-3.14.5
make menuconfig O=../linux-3.14.5 /* i didn't change anything */
make O=../linux-3.14.5
cd ../linux-3.14.5
sudo make install
I could see a file called initrd.img-3.14.5 in /boot alongside the intrd.img-3.13.0-24-generic (which i guess, is the kernel of Ubuntu 14.04).
There were also 2 files called vmlinuz-3.14.5 and vmlinuz-3.13.0-24-generic.
After that, ran
sudo blkid
and got the following:
/dev/sda1: UUID="92ec153c-cb92-4300-8d2a-f63b747ddd35" TYPE="ext4"
/dev/sda5: UUID="439a6423-28dc-4363-b47e-580f1e65e951" TYPE="swap"
I also ran
sudo fdisk -l
which gave me
Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000268be
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 39845887 19921920 83 Linux
/dev/sda2 39847934 41940991 1046529 5 Extended
/dev/sda5 39847936 41940991 1046528 82 Linux swap / Solaris
I checked the /boot/grub/grub.cfg file which had the following entry:
menuentry 'Ubuntu, with Linux 3.13.0-24-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.13.0-24-generic-advanced-92ec153c-cb92-4300-8d2a-f63b747ddd35' {
recordfail
load_video
gfxmode $linux_gfx_mode
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 92ec153c-cb92-4300-8d2a-f63b747ddd35
else
search --no-floppy --fs-uuid --set=root 92ec153c-cb92-4300-8d2a-f63b747ddd35
fi
echo 'Loading Linux 3.13.0-24-generic ...'
linux /boot/vmlinuz-3.13.0-24-generic root=UUID=92ec153c-cb92-4300-8d2a-f63b747ddd35 ro find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.13.0-24-generic
}
So, I went ahead and added the following lines to /etc/grub.d/40_custom ( i just changed lines 1, 14, 15 and 17)
menuentry 'MyNewKernel' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 92ec153c-cb92-4300-8d2a-f63b747ddd35
else
search --no-floppy --fs-uuid --set=root 92ec153c-cb92-4300-8d2a-f63b747ddd35
fi
echo 'Loading My New Kernel ...'
linux /boot/vmlinuz-3.14.5 root=UUID=92ec153c-cb92-4300-8d2a-f63b747ddd35 ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.14.5
}
and ran
sudo update-grub
sudo reboot
Did not work! The error message said
ALERT! /dev/disk/by-uuid/92ec153c-cb92-4300-8d2a-f63b747ddd35 does not exist.
Dropping to a shell!
So I tried replacing the UUID by /dev/sda1 resulting in the following file.
menuentry 'MyNewKernel' {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 /dev/sda1
else
search --no-floppy --fs-uuid --set=root /dev/sda1
fi
echo 'Loading Linux 3.13.0-24-generic ...'
linux /boot/vmlinuz-3.14.5 root=/dev/sda1 ro recovery nomodeset find_preseed=/preseed.cfg auto noprompt priority=critical locale=en_US
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-3.14.5
}
That did not work either, and gave me a very similar error message.
ALERT! /dev/sda1 does not exist.
Dropping to a shell!
I think I am doing some stupid mistake, but I cant figure out what, since this is my first time. I would appreciate any help.
Thanks for reading through the long post. Please let me know if you need any more information.
PS. I cant post pictures due to a lack of reputation.