Is there any way to install multiple Linux distributions on single system?

[bqc]

[pwg]

Yes:

At least two ways:

1) install into separate disk partitions, setup boot loader to allow you to select a given one at boot time.

2) install one on the system as the main install, install VirtualBox into the main install. Create, and install into, as many virtual machines as you like.

[OhMeadhbh]

Sure. Multi-boot and have Grub decide which one to launch at boot time.

[bqc → OhMeadhbh]

Could you please describe it?

[sargstuff → bqc]

one possible approach: linux multi-boot usb drive: http://github.com/adi1090x/uGRUB