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I've seen quite a few posts around about running multiple distros but not sure they apply to using LVM (and without Windows). I'm using a machine that's about 3 years old. Setup:

 Intel Core i7 2.8GHz
 8GB Ram

At this point, I'd like to install 12.10 and Mint 14, leaving the option open to install additional distros down the road.

I could be way off, but I'm thinking about creating at least 2 primary /boot partitions (1 for 12.10 and 1 for Mint) and another partition for LVM leaving room for additional /boot partitions. Then creating a VG and separate LVs for Ubuntu 12.10 and Linux Mint 14. I understand I can share partitions between the 2 installs, but I'm only using this for testing and I have tons of space to play with. LVM seemed logical considering I may want to install and test additional distros. I guess I could share the /swap partition across the board without problems, right?

I'm unclear about GRUB2. How do I handle the bootloader situation? Install 12.10 and get it running then make changes to grub.cfg after installing Mint? And do I not install GRUB for Mint or do I install it in a different location? Any guidance would be appreciated.

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With grub2 you do not need a separate /boot partition. You can either have the other distros not install a boot loader, or reinstall the Ubuntu grub2 and when you run sudo update-grub from Ubuntu, it will detect the other installations and add them to the menu.

Note that the last time I tried this with Mint, its installer did not seem to recognize LVM.

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