CODE SOLUTION

This post about dependency problem in kali linux/ ubuntu when you  face dependency problem like sudo apt-get install libpng12-0 Reading package lists... Done Building dependency tree Reading state information... Done Package libpng12-0 is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'libpng12-0' has no installation candidate    now you can do this  1. type command in terminal "sudo apt-get install libpng12-0"   If you face some error  you can do this You can download the libpng12-0 from here.     http://packages.ubuntu.com/xenial/i386/libpng12-0/download for 386 architecture  and http://packages.ubuntu.com/xenial/amd64/libpng12-0/download for 64 bits.      By download and install you can fix this problem if you face any kind of problem you can ask me in comment section.

This post about repository issues some times when you want  to install software by terminal like (" sudo apt-get install codeblock")    you get  "E: Unable to locate package"   Error   To solve this problem    1. open terminal   2. run this command "leafpad /etc/apt/sources.list"   and replace with this # # deb cdrom:[Debian GNU/Linux 2016.1 _Kali-rolling_ - Official Snapshot amd64 LIVE/INSTALL Binary 2$ # deb cdrom:[Debian GNU/Linux 2016.1 _Kali-rolling_ - Official Snapshot amd64 LIVE/INSTALL Binary 2$ deb http://http.kali.org/kali kali-rolling main non-free contrib deb-src http://http.kali.org/kali kali-rolling main non-free contrib deb http://ftp.be.debian.org/debian/ wheezy main save and close the file after that 1. sudo apt-get clean 2. sudo apt-get update 3. sudo apt-get -f install now you can install what you want  if you face any kind of problem you can ask me in comment section