I’ve been wondering how to convert this Ubuntu desktop to server. Also how Bitnami cramps an image of Ghost and ubuntu Server.

Well enough wondering.

sudo apt-get install tasksel
# Note: this may take a few minutes to complete
sudo tasksel remove ubuntu-desktop
# This will convert Desktop to Server
sudo tasksel install server
sudo apt-get install linux-server linux-image-server
sudo apt-get purge lightdm

Edit /etc/default/grub and update to this configuration

GRUB_TIMEOUT=5
# Comment out ‘GRUB_HIDDEN_TIMEOUT’
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_CMDLINE_LINUX_DEFAULT=""
# only for PC
GRUB_TERMINAL=console 

Then run: sudo update-grub

When you’re done, reboot

sudo reboot