Thank you for advices! I installed Android 5.1.1, but to make it work, manual formatting Data and Cache in ext4 was necessary. Installation of Nethunter was smooth. 
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Posts made by lukaszmarczyk
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RE: Moving from UT to Kali Nethunterposted in Off topic
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Moving from UT to Kali Nethunterposted in Off topic
Hello, I recently bought a Nexus 5 Hammerhead from the second hand with installed Ubuntu Touch. Now I'd like to test Nethunter but I have no idea how to switch OS - all the tutorials and threads are about going from Android to NH, but what should I do if I want to move from UT? Is it necessary to install Android first?