I download the iso-image and tried installing debian 8.7. Everything went well but by the time i wanted to install it on my thinkcenter m93, i dont know whether it is windows10 or ubuntu 16.04 trying to block my installation ....all other options will just fail at the point where i needed to make a partitioning. So i decided to take everything else off and just install debian. It did not work the only installer that worked for me was the non graphical installer...so i took that option and yes it did take everything else off and did create the grub menu on my hard disk. But when i boot into debian it just bring me a bash/console to login and then i cannot load any graphical interface to continue with. i tried many different tutorials for example i ran these:...
apt-get install kde-standard,
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apt-get update
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apt-get install aptitude tasksel
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"E:Could not open lock file /var/lib/apt/lists/lock-open (13: permissioin denied)"
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"E: could not unlock the administration directory"