I am not having an account on GitHub, hopefully posting it here is also useful. I had to run
sudo apt-get install libgconf-2-4
to make it work at all. Then starting the wallet I get the following message:
LaunchProcess: failed to execvp:
/home/supersecretdude/Documents/NEM/NanoWallet-1.4.13/nacl_helper
[2584:2584:1025/203522:ERROR:nacl_fork_delegate_linux.cc(315)] Bad NaCl helper startup ack (0 bytes)
And when saving or importing a wallet things look like this:
Other than that things seem to work alright.