Install Updates could not successfully download and install available updates.

[stevef]

You need to open a terminal session and run two commands, entering your password when asked for.

first

Code:

sudo dpkg --configure -a

then

Code:

sudo apt --fix-broken install

Additionally you may wish to consider tidying up some of the older and unused kernels you have on your system.  This isn't contributing to your current update problem but it will free up some disk space.  Take a look at Kernel Remover under Lite Tweaks.