Ubuntu 18.04 Server installation crashes when choosing partition

Question

The partition table on my machine is MBR and it looks like this:

sda4 (extended)

-sda5   - 1000MB /boot for Ubuntu Desktop 18.04 - ext4
-sda6   - 1000MB not used - ext4
-sda7   - 1000MB not used - ext4
-sda8   - 30GB / for Ubuntu 18.04 Desktop - ext4
-sda9   - 30GB not used - ext4
-sda10 - 30GB not used - ext4
-sda11 - 12GB swap
-sda12 - 700GB /home - ext4

As you can see I have already successfully installed Ubuntu 18.04 Desktop. Partitions were made with GParted when installing Ubuntu 18.04 from a live USB. When I try to install Ubuntu Server 18.04, at the stage of selecting partitions, when I select the 9th partition, the installation process crashes every time.

This is how the report looks :

Answer 1

Even though the date shown in your screen capture would not support this, you might require the accepted solution in Ubuntu 18.04 Installer crashes on Dell XPS 15 9560 (related: Installer crashed when trying to install Ubuntu 18.04).

I wouldn't think you are experiencing Ubiquity install wizard crashes; cannot install ubuntu-MATE 18.04.4.

Related:

1. Why "maybe-ubiquity" on default kernel command line?
2. https://serverfault.com/questions/196625/can-ubuntu-server-be-installed-on-the-same-machine-running-ubuntu-desktop-if-ye