App version & installed?

[Grizzly]

23 September 2018  at 16:44, Ralf Mardorf wrote:
Re: App version & installed? (at least in part)

>On Sun, 2018-09-23 at 14:38 +0100, Grizzly via ubuntu-users wrote:

>> rm /usr/local/bin//aircrack*
 
>> is going cause problems?

>What kind of problems should it cause?

Well you never know what may happen if you remove a dir/folder  

>It shouldn't cause any problems, but also won't gain much, there are likely
>more related files installed to /usr/local/*, take a look at the package for
>Xenial, which at least does use a different prefix 

I do now have most of the apps work
show up on apt-cache policy and
which shows them in usr/bin (after I cleared out the same files from 
usr/local/bin)

there are a few files/dirs below /usr/local/ can they also go?