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2

Installing Ubuntu 20.04 NOT alongside Ubuntu 16.04

rated 0 times [ 2] [ 0] / answers: 1 / hits: 2488 / 1 Year ago, sat, april 15, 2023, 9:22:08

I have a UEFI laptop with two disks, /dev/sda and /dev/sdb.
Ubuntu 16.04 is installed on /dev/sdb. There is already an ext4 partition of /dev/sda, but I want anything there to be overwritten.
I wish to install Ubuntu 20.04 on /dev/sda, such that:
1) During a transition period, I can boot from either Ubuntu 16.04 or Ubuntu 20.04
2) After a transition period, I will delete Ubuntu 16.04 from /dev/sdb
3) I don't have to physically disconnect /dev/sdb before doing the installation

I boot the computer from a USB with the Ubuntu 20.04 image on it. When I get to the screen asking for the installation type:

Q1) I presume I should choose "Something else", because installing Ubuntu 20.04 alongside 16.04 will install it on /dev/sdb, which I do not want. Is this correct?

Q2) After selecting "Something else", do I choose /dev/sda or do I choose /dev/sda1 (which already has the ext4 filesystem on it)?

Q3) On the same screen, where I am asked for the device for the boot loader installation, the options are:
/dev/sda
/dev/sda1
/dev/sdb
/dev/sdb1
/dev/sdb2 Ubuntu 16.04 LTS
Given my goals as described above, which option should I choose?

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biryanrownies

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answered 1 Year ago ickump · Accepted Answer

I suggest that you start by unplugging /dev/sdb. That way there is no risk that you will touch it during the installation.

After that it is straightforward to install Ubuntu 20.04 LTS into /dev/sda. Reboot and check that it works.

Next shutdown and connect /dev/sdb.

Boot into /dev/sda and from there run
```
sudo update-grub
```
It should identify the operating system in /dev/sdb and add a grub menuentry for it.

When you no longer want the old operating system you can remove it (by erasing it or unplugging the drive). Then run
```
sudo update-grub
```
and the menuentry for it will be removed.