Re: Dualboot with LVM/LUKS

[Andrey Borzenkov]

В Thu, 8 May 2014 06:26:57 +0100 (BST)
Andreas Riedel <address@hidden> пишет:

> Dear GrubUsers,
> 
> I've to install two Ubuntu-Systems on the same machine. Something that is 
> descript in many place if the systems are unencrypted becomes very hard in 
> that moment the system are encrypted.
> 
> This is my setup:
> 
>     sda1 (256MB) P-Partition /boot

Shared boot is in general bad idea.

>     sda2 (320GB) P-Partition / -- MainSys
>     sda5 (64GB)  P-Partition / -- MultiMediaSys 
> 
> 
> 
> I figure out how to install this both systems encrypted. But installing the 
> second system it becomes clear that I will come in trouble. While install the 
> second system the install-process can't see the other installation. Totally 
> clear, it can't look into the encrypted partition. Therefore no GRUB was 
> configured for Dual-/Multi-Boot. That means, I've to configure GRUB manually.
> 

What is not clear - did you install second system successfully? Could
you boot it?

What you could do - mount root from main system manually and re-run
grub configuration again. This should add second system to menu.

> It's not easy the find an tutorial anounce this (and nothing to post here, 
> because my native language is german) but I come too the following 
> (unsuccessful) solution:
> 
> sudo su
> cryptsetup luksOpen /dev/sda2 MainSystem
> mount /dev/mapper/MainSystem /mnt
> mount /dev/sda1 /mnt/boot
> mount -o rbind /dev /mnt/dev
> mount -t proc proc /mnt/proc
> mount -t sysfs sys /mnt/sys
> chroot /mnt
> grub-install /dev/sda
> 

Note that it does not update grub configuration which probably still
points to the second system. You need additionally run grub-mkconfig
(or some distribution specific tool that does it) to rebuild
configuration so it points to new root.

> I know, this solution is incomplett. This setup will, even if it runs, only 
> configure the MainSystem. It will not, and that is the most imported part, 
> setup both, Main and MultiMediaSystem. But as I said, even this simpler 
> example I didn't get running.
> 
> It ended up, that I still have the encrypt sda5
> 
> UUID------------......(sda5)
> and even if I give the passphrase for this system the system will not start
> 
> Gave up waiting for root device
> ....
> (intiramfs)
> 
> So, it's totally frustrationed. It seams to be so abnormal to install 2 
> encrypted system that I can not find any solution for it in the WWW.
> 
> Because both installation are totally unworked I will be grateful for every 
> hint.
> 
> Andreas 
> 
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