Set up of Python 3.5 on Kubuntu 16.04

[SageReal]

i've run the code and it seems to have done something, so now do i paste the copied sources.list and replace the one that is in my on my kubuntu? because it's still giving me the same error message.

[Snowhog]

Your problem is that the cd-rom repository is still active; it shouldn't be after installation.

Edit sources.list again (kdesudo kate /etc/apt/sources.list) and when it is opened for editing, put a # in front of the following entry:

deb cdrom:[Kubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main multiverse restricted universe

so that it looks like:

#deb cdrom:[Kubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main multiverse restricted universe

You also have a Debian Breezy repository entry, which I don't think should be there:

deb http://kubuntu.org/packages/kde35 breezy main

Put a # in front of it as well (It is generally not a good idea to mix different Linux Operating System repositories).

Save and close the file. Then open a konsole and type:

sudo apt-get update && sudo apt-get dist-upgrade

Let it finish and when the prompt is again visible type:

sudo apt-get install python3-dev python-pip

[SageReal]

i think i have figured out what the actual problem is, My Repositories. It seems I can't install anything from my repositories. I have tried with Vlc, Python 3.5, And anything else I have found worth trying to install but all to no avail. They all bring the same error message, " Unable to Locate package".
if you could help me with this, i think i'll have solved the whole package of problems i face....

[SageReal]

thank you, it has started to update the softwares.

[SageReal]

Your problem is that the cd-rom repository is still active; it shouldn't be after installation.

Edit sources.list again (kdesudo kate /etc/apt/sources.list) and when it is opened for editing, put a # in front of the following entry:

deb cdrom:[Kubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main multiverse restricted universe

so that it looks like:

#deb cdrom:[Kubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main multiverse restricted universe

You also have a Debian Breezy repository entry, which I don't think should be there:

deb http://kubuntu.org/packages/kde35 breezy main

Put a # in front of it as well (It is generally not a good idea to mix different Linux Operating System repositories).

Save and close the file. Then open a konsole and type:

sudo apt-get update && sudo apt-get dist-upgrade

Let it finish and when the prompt is again visible type:

sudo apt-get install python3-dev python-pip

MUCHOS GRACIAS!!!! It has worked. YAAAAAAAAY!!!!!!