Grub2 - Triple booting error - 3rd Distro not detected.
I currently on my laptop have Windows7 and Ubuntu 12.04 dual booting. I created some space so I could install and run Sabayon or Kororaa as well.
Basically the drive is set up like this/
/dev/sda4 Ubuntu Swap
/dev/sda5 Ubuntu root
/dev/sda6 Ubuntu home
/dev/sda7 50Gb free space
When i installed fedora the install went fine it actually reinstalled grub without asking and so booted on restart. I went back into ubuntu and reinstalled grub 2 to the MBR and ran update-grub2. However now Fedora was not detected.
Fedora created /sda7 into an LVM of sda7 a 500mb boot and 3 other LVM'd partirions 8/9/10. However when you update grub2 from ubuntu you now do not see Fedora.
So i removed fedora and installed Sabayon, Sabayon uses anaconda and so instal was basically the same as Fedora and the result was also an LVM like Fedora. Again however using update-grub2 Sabayon cannot be seen or booted it does not detect that the LVM existed at all.
So I thought should do an old school non lvm setup so I grabbed the Fedora disk and created a manual install and created
install, nice and simple. When the installer asked to install grub I skipped it so as not to interfere with the grub2 I control from ubuntu.
However still when I ran update-grub2 in ubuntu there was no linux partitions or distro's detected by grub2 and fedora was unable to boot.
How can I get grub2 to recognise newly installed distro's installed after /dev/sda7?
I've had instances where the newest OS wasn't recognised by grub2 because the partition wasn't mounted. Mounting the partition and running update-grub2 solved the problem for me. In your case:
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 92008447 46003200 83 Linux
/dev/sda2 149790121 156248189 3229034+ 5 Extended
/dev/sda3 92008448 93032447 512000 83 Linux
/dev/sda4 93032448 149788671 28378112 8e Linux LVM
/dev/sda5 149790123 156248189 3229033+ 82 Linux swap / Solaris
When I execute that command:
shapulani@shapulani-desktop:~$ sudo mount -t ext4 dev/sda3 /mnt/
mount: special device dev/sda4 does not exist
I need help thanks
Your post shows you are trying to mount sda3 and your error shows sda4 is not present. Typo?? You need a forward slash in front of dev for starters as well as the correct partition:
shapulani@shapulani-desktop:~$ sudo mount -t ext4 /dev/sda3 /mnt/
shapulani@shapulani-desktop:~$ sudo update-grub
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.2.0-31-generic-pae
Found initrd image: /boot/initrd.img-3.2.0-31-generic-pae
Found linux image: /boot/vmlinuz-3.2.0-30-generic-pae
Found initrd image: /boot/initrd.img-3.2.0-30-generic-pae
Found linux image: /boot/vmlinuz-3.2.0-29-generic-pae
Found initrd image: /boot/initrd.img-3.2.0-29-generic-pae
Found memtest86+ image: /boot/memtest86+.bin
Found Windows 7 (loader) on /dev/sdb1
Still no joy
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