**How can I get myself out of this boot loop?**

I am a bit at a loss, my Grub screen is empty (shows no options to choose from.) I now only have access to Grub options if I hold down the `Shift` key during the time Grub is being processed. 

I got myself into this pickle while upgrading Ubuntu 19.04 to 19.10, and something went wrong.

I started going through the different Kernel options to see if one would get the system back up. The last one did. I was able to get to a login window; however, logging into Ubuntu would not work. So I tried logging in using the Unity Desktop option. This brought me to the Unlock Login Keyring. But the Unity Desktop UI is empty -- besides a auto-start opening Rhythmbox. Somehow in **Unity** or **Ubuntu-MATE**.
I can't get a Terminal doing `Ctrl`+`Alt`+`T`. 

As suggested, using `Ctrl`+`Alt`+`F5` works, but I can't figure out what is missing in order to boot into Ubuntu Desktop 19.10, tty5 login states: 

> 
> Welcome to Ubuntu 19.10 (GNU/Linux 5.3.0-19-generic x86\_64)
> 
> 
> 

I tried login into `unity --:1` to get into a standard UI 
[based on this helpful post](https://askubuntu.com/questions/148717/how-do-i-boot-into-the-console-and-then-launch-the-ubuntu-desktop-from-it/148721) but got this:

```
compizconfig - Info: Backend     : gsettings
compizconfig - Info: Integration : false
compizconfig - Info: Profile     : mate
Switched to profile 'unity-lowgfx' (for enfironment 'mate')
compizconfig - Info: Backend     : gsettings
compizconfig - Info: Integration : false
compizconfig - Info: Profile     : unity-lowgfx
WARNING: no DISPLAY varable set, setting it to :0
compiz (core) - Info: Loading plugin: core
compiz (core) - Info: Starting plugin: core
compiz (core) - Info: Loading plugin: :1
compiz (core) - Error: Failed to load plugin: :1

```

It looks like it is somehow switching to mate and fails loading the plugin.

Doing a reboot brings me straight back into some leftover Ubuntu-MATE; without UI -- not very helpful.