But wait....there's more...!
I know you just love some detail....so here it is.
close everything so you are looking at the desktop
click on menu button, type in: synaptic package manager.
click on it. It will then ask for your password. type it in.
When the nxt window opens...don't panic.......just take your attention to the top right hand corner of that window that opened....and it will say : search
Click on that and a little box will open...its name will be Find. In the search box type : LibreOffice and then hit enter
A page will open with all sorts of crap on it...FIRST...scroll down slowly (they are in alphabetical order) and find libreoffice-calc when you find it....just click on it once so that it is highlighted
Then up the top in the left hand corner, it will have :File, Edit, package, settings, about
Click on Package.......go down the opened list and find LOCK VERSION....click in the box.
Then repeat the same procedure for LibreOffice-writer......lock that version too
That's it.
Done