For reasons stated further above I like to propose changing the status
of this bug to critical.

I eventually managed to setup a swap file and enable hibernation. The
following steps are copy pasted together from various different
websites. Here are the changes I have made:

First find out how large your swap file should be. There are several
recommendation tables you can find on Google. Adjust the needed size of
the swap file below to your needs.

Setup swap file:

sudo swapoff -a                                    # Turn off all swap space.
sudo rm /swapfile                                  # Delete current swap file.
sudo dd if=/dev/zero of=/swapfile bs=1M count=16384 # Make a new 16GB swap 
file. (Adjust to your needs)
sudo chown root:root /swapfile                     # Set owner to root, group 
root
sudo chmod 0600 /swapfile                          # Set permission to root
sudo mkswap /swapfile                              # Convert file to swap format
sudo swapon /swapfile                              # Enable

Enable to swap file on boot. Add the following line to /etc/fstab using your 
favorite editor: 
/swapfile       none    swap    sw      0       0

Enable hibernation:
sudo apt install uswsusp
sudo apt install hibernate

Test if hibernation works with this command:
sudo hibernate

If everything looks good continue by changing the hibernation engine to use the 
hibernate command. Edit hibernation service:
sudo systemctl edit systemd-hibernate.service

Paste the following code:
[Service]
ExecStart=
ExecStartPre=-/bin/run-parts -v -a pre /usr/lib/systemd/system-sleep
ExecStart=/usr/sbin/s2disk
ExecStartPost=-/bin/run-parts -v --reverse -a post /usr/lib/systemd/system-sleep

Next update systemd:
sudo systemctl daemon-reload

Now you should be able to hibernate with the default system command:
sudo systemctl hibernate

Enable hibernation in the UI by following this guide:
http://ubuntuhandbook.org/index.php/2018/05/add-hibernate-option-ubuntu-18-04/

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https://bugs.launchpad.net/bugs/1767299

Title:
  Ubuntu 18.04 Installer creates swap partition too small

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