Install Linux on external media?

My notebook ThinkPad lenovo x61 has as a sole system Linux Ubuntu 18.04.

I want to install Linux Mint on an external medium, how should I do this? The medium has a size of 320 GB. Do I have to possibly remove the internal hard drive for installation on the external medium? I also own a new notebook which I use only for office work, the ThinkPad is only as a teaching and you. Exercise device serve.

I'm grateful for a successful answer for me!

Normal on the medium Install and also select the medium as installation location for the bootloader.

I want to install Linux Mint on an external medium, how should I do this?

There are exactly two things to watch out for:

Specify the correct device (here probably / dev / sdb [0-9]) to install on
For GRUB (the bootloader) also specify the right device.

Whether at 2. Also / dev / sdb is the right one depends on whether you want to start the installed system only s.den ThinkPad lenovo x61 or elsewhere.

If GRUB is installed in the MBR of / dev / sda, then the selection always appears on this laptop and fails to start Linux-Mint if the external data medium is not connected.
Any other system, e.g. Of course, another Linux or a Windows can be selected and started.

Do I have to possibly remove the internal hard drive for installation on the external medium?

No, not really, but if you do you exclude specifying a wrong device and data loss on it.

the ThinkPad should only be used as a teaching and Exercise device serve.

Why not then install it directly, so next to the existing Ubuntu?

Linux Hase