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I have an 500gb external usb hard drive. I wanted to install a couple of linux operating systems including Ubuntu and Arch Linux. I have installed Ubuntu 11.10 and it ...
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  1. #1
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    Installing Ubuntu and Arch Linux on 500gb external hard drive


    I have an 500gb external usb hard drive. I wanted to install a couple of linux operating systems including Ubuntu and Arch Linux. I have installed Ubuntu 11.10 and it works fine. I can't figure out though how to install Arch Linux on the remaining hard drive. I have included a screenshot of my external hard drive from gparted. So the 25gb that i labeled arch thats the part that I wan't arch linux installed on.
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    Just Joined! charleseddy's Avatar
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    It should be relatively straightforward. Boot into your Arch Linux installation disk, and during the installation process, select a custom partition table. Then give the mount point of / (just a slash, nothing else) to the Arch partition, which will make it the one where the data is installed. You can also give a mount point to your Ubuntu partition (for instance, /ubuntu or /media/ubuntu) so that it's automounted each time you start your Arch session and you can access the data.

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    Quote Originally Posted by charleseddy View Post
    It should be relatively straightforward. Boot into your Arch Linux installation disk, and during the installation process, select a custom partition table. Then give the mount point of / (just a slash, nothing else) to the Arch partition, which will make it the one where the data is installed. You can also give a mount point to your Ubuntu partition (for instance, /ubuntu or /media/ubuntu) so that it's automounted each time you start your Arch session and you can access the data.
    Ok so I created a / partition in cfdisk in the Arch Linux installation. I then selected the packages I wanted and installed it. I didn't install grub since I wan't to boot from the grub in my ubuntu. So I updated the grub and next time I rebooted it found Arch Linux on dev/sda4 (which is the partition I assigned / to). I tried to boot it and cam with this error message:
    Waiting 10 seconds for device dev/sda4 ...
    Root device 'dev/sda4' doesn't exist. Attempting to recreate it.
    ERROR: Unable to determine major/minor number of root device '/dev/sda4'.
    You are being dropped to a recovery shell
    Type 'exit' to try and continue booting
    sh: can't access tty; job control turned off
    [ramfs /]#
    I went on Ubuntu and checked gparted again and it showed /dev/sda4 as and ext4 partition with mountpoint /media/arch. I don't understand what happened. Do I have to make a /boot partition? I am using Ubuntu 11.10 and Grub 1.99

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    Just Joined! charleseddy's Avatar
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    I would have let Arch remake the Grub, as I don't see why it would cause a problem...

    It appears as if the error you're describing should mean that the partition is showing up as hda4 instead of sda4, described in the ArchLinux wiki here.

    No need for a boot partition then, as the installation should have taken place correctly. Rebuild the grub using

    Code:
    sudo update grub
    and see what happens. At the worst, you'll have to go in and edit the grub configuration by hand (admittedly not that much fun since Grub 2).

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