[Ubuntu Touch Q&A, Help & Troubleshooting] ShadowEO:
YaaBaa1986, Ask and ye shall receive. I'm a very accommodating person, so asking for help does not offend me one bit. However you may find these to be a bit hard to use on the MX4 without an external display.

Unfortunately, it seems in the latest version of Libertine, the app is once again broken when it comes to making a container and installing applications, so you will need to use Terminal for it.

But a nice noob proof howto (provided your system image is writable):

1) Open terminal and sudo su.

2) When you see the # in your prompt, you're executing as root, this is good for this stage. If your system image is not writable yet, type

touch /userdata/.writable_image

and reboot. When the system starts back up, continue from a root prompt (Step 1)

3) In terminal as root, type apt-get update && apt-get install libertine python3-libertine-chroot and press enter. It will install some packages to your system image. Once the package is complete, type exit to go back to an unprivileged prompt (prompt will be suffixed with $, this is the prompt for your user account and is needed for the next steps, libertine does not run under root or sudo)

4) Now it's time to create your container, so at your normal terminal prompt, type the following (you can change it if you'd like, this is an example)

libertine-container-manager -i vivid -n Applications -t chroot

, It will begin running debootstrap to create your libertine container, let it run. If this does not work, you will need an ubuntu laptop to use phablet-shell or adb shell, but phablet shell is preferred, for this step (Libertine seems to hate running under the Unity 8 terminal application due to AppArmor's confinement).

5) After your container has been created and installed and you are back at your prompt, you can begin to load applications into it. To do so, use the following command

libertine-container-manager install-package -i vivid -p <package name>

NOTE: If you changed the container ID ( -i vivid ) in the creation step, you will need to substitute it here as well. The -p parameter is only good for ONE package at a time (dependencies don't count, but you can't do something like "libreoffice default-jre", you need to install libreoffice and default-jre separately)

6) If you need to remove a package, you can use the following command:

libertine-container-manager remove-package -i vivid -p <package name>

Got your container all ready to go with your apps installed? But how do you start them? Easy. Go back to the Apps Scope and open the Ubuntu Store, search for Libertine Scope and install it, then swipe up from the home screen and you'll see a new "XApps" scope, this contains your applications.

Noob-easy DPI hack:

So the screen looks UBER small to you? That's fine, it does for most of us, open your terminal and follow the below:

1) In terminal, type or paste the following (you can paste by long-holding on the screen):

nano /home/phablet/.local/share/libertine-container/user-data/vivid/.Xdefaults

This will provide you with an empty editor ready for things to be entered. Type the following (NOTE, this is personal preference, tweak it till you're happy and follow the notes below for getting it looking better):

Xft.dpi: 175

To make your applications look better instead of the default Raleigh theme, use the commands above to install the lxappearance package and follow these instructions to add the NoobsLab Themes PPA:

1) From a normal prompt, type

libertine-container-manager configure -a ppa:noobslab/themes

Once done, type

libertine-container-manager update

2) To search through themes available for installation type

libertine-container-manager search-cache -s noobslab -i vivid

which is functionally the same as apt search noobslab. The use the l-c-m install-package command above to install the themes you find.

3) Once done, go to the XApps scope and open LXAppearance and you'll see your themes there. If you have any applications open already, you will need to close them and reopen to get them to pick up the new settings.

Note: If you install libreoffice, I would suggest changing the Default font in LXAppearance to Liberation Sans 13pt.

For On-Screen Keyboard, install the packages maliit-inputcontext-gtk2 and maliit-inputcontext-gtk3. Next time you open a GTK+ application you should see the system keyboard in the X applications.

Whew, I hope that helps :D If it does I'll move this over to the OP and replace the horrible instructions I wrote up in a hurry yesterday.

By the way, how did you get the wallpaper to change via Terminal? I've been trying with gsettings so I could make a wallpaper sync system between my PC and the tablet, but when I use gsettings, it just doesn't change.