In the Mint (8) installer (but also the Ubuntu Desktop one) there is no support for LVM volumes. So if you want to install it on one, you have to do it by hand. I will show you how:
Boot from the CD, install LVM and make all existing volumes active:
apt-get install lvm2 vgchange -a y
Should display your volumes
Run the installer. After all packages are installed and the bootloader is configured your system will reboot. Unfortunately it won’t boot! This is because there’s no LVM support build in the initramfs
To install this support we have to boot from the CD again. What we then do is mount the just installed system (in my case a / partition and and /boot partition).
apt-get install lvm2 vgchange -a y mkdir -p /mnt/lvmroot mount /dev/lvm/root /mnt/lvmroot mount /dev/sda1 /mnt/lvmroot/boot mount --bind /dev /mnt/lvmroot/dev mount -t proc proc /mnt/lvmroot/proc mount -t sysfs sysfs /mnt/lvmroot/sys mount -t devpts devpts /mnt/lvmroot/dev/pts
After mounting all needed “partitions” we can chroot into it:
We are now in the OS that’s on the hard disk. That’s where we want to add LVM support. The initramfs will be updated automatically.
apt-get install lvm2
We can now reboot. The system should be able to boot Mint now. Have fun!