Im making this post from my phone! If i don't provide any format to the text is because of that.
I know there is a tutorial for this already using filza, but some users are having problems with it or found it too complicated. So im just providing an alternative to that.
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1) go to cydia and add this repo:
https://cydia.hbang.ws/
And look for a tweak called "NewTerm 2". We're gonna use that terminal for now, since mTerminal is not working.
2)Download the .deb that you want to install using safari default browser. Remember the name of the .deb that you just downloaded, for example "candycrush.deb" Dont try to open it with filza or anything else, just leave it there.
(Its optional if you want to use filza to change the name of the .deb file to a shorter name so it would be easy to add it to the line code below).
3)Open NewTerm 2, type "su", hit enter. enter the password "alpine". then just type (or copy this line and modify the name of the deb) this:
dpkg -i /var/mobile/Documents/nameofthefile.deb
(If you get "cannot access" error try with this):
dpkg -i /var/mobile/nameofthefile.deb
Then Hit enter.
4) Then type:
killall SpringBoard
And hit enter to apply it (Respring device) [thanks to @bbReakMe for the suggestion]
And thats it, it should install your .deb without any problems. Now just do a quick respring and it should be working fine. If you want to uninstall it, go to cydia, recent packages and it should be there, then just uninstall it.
Make sure to have "Debian packager" and "Debian Utilities" installed.