Update Manager seems to be a welcome addition not just for my Linux Lite installs. A few hundred users do prefer the stripped down version I made available for Linux Lite 3.x Series. Well, Linux Lite 4.x is out and I have’t posted in the blog for a little while (work and life is keeping me busy) and I honestly forgot to mention that a Diamond (bionic) version is available in my repository. Read no more, if you want to use Update Manager in Linux Lite 4.x just install it as follows:
Installing Update Manager
To install Update Manager, from Terminal:
Add Unlockforus repository to if you haven’t done so yet:
~$ echo "deb https://unlockforus.com/repository/dists/bionic/ /" | sudo tee /etc/apt/sources.list.d/unlockforus-bionic.list
And add the PGP key:
~$ curl -s https://unlockforus.com/repository/keyFile | sudo apt-key add -
Finally, install Update Manager:
~$ sudo apt-get update && sudo apt-get install mintupdate-lite -y
The new version features the same options available in previous versions so you shouldn’t miss a thing 
Cheers!
nice.