Dual Boot

How do I run two (or more) operating systems on the same computer?

There are two main ways to do this: dual-booting, and running a virtual machine.

Dual-booting installs separate operating systems on separate disks or partitions, allowing you to choose between then when you start up your computer.

Virtual machines let you run a a simulated computer running a second operating system, as an application installed in the primary one.

Dual-booting is a bad idea and you shouldn't do it.

Dual-boot systems are fragile and hard to maintain:

  • Managing partitions and boot loaders can be difficult and time-consuming unless you have a lot of experience with it.
  • It's easy to break the boot environnment, losing access to one or even both of your operating systems.
  • Recovering from a broken boot environment can be extremely difficult, and it's possible to break things even more.
  • Sharing files between the two operating systems can be problematic, and one OS can quite easily damage another one's system files.
  • Removing an unwanted dual-boot OS can be difficult, and often the disk space can only be reclaimed as a separate drive letter under windows.

For these reasons, CSG strongly recommends against dual-booting your computer.

Also for these reasons, CSG will not help you to repair a broken dual-boot environment.

We can (potentially) rescue your data, wipe the drive and help you install a new single OS, but we can't help with getting both OSes up and running again.

You are free to set up a dual-boot system, but you do so at your own risk.

If you have to dual-boot

In rare cases - when you need direct access to the hardware, or performance/resources are of primary concern, you might find you need to dual-boot anyway.

If so, here's some documentation that can get you started:

Virtual Machines

Virtual machines are a much more stable and maintainable way to work with multiple operating systems.

They use a virtual disk partition in a file inside your native operating system, and the software itself runs as a normal application.

File sharing is managed by the application, and is very safe to use.

It's also very easy to install, remove and back up multiple virtual machines, and you can even transfer them to other computers with no problems.

There's a slight extra performance/resource cost on your machine, but this is not very high and is more than made up for by the other benefits.

There are a number of different hypervisors on the market, but the two we recommend are:

VMware
Full-featured commercial product.
CSE has an Academic licensing program for staff and students, with some restrictions.
Oracle Virtualbox
Slightly smaller feature set, but more than enough for most cases, and completely free to use.
Download from virtualbox.org.

Once you have one of these packages installed, you can download Linux or Windows to install in the Virtual machine.

Alternative approaches

If you just need access to a few bits of software and not a full second operating system, there are some alternatives available:

Windows Subsystem for Linux
The WSL lets you install a stripped-down Linux distribution directly into Windows 10
CSE Login servers
CSE has a number of Linux login servers you can use.
CSE VLAB
We also have a virtualised linux desktop available
Last edited by jbc 11/01/2018