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i use nomachine and it works great

delete all the stuff in your downloads folder via gui,
redownload nomachine
then open your file browser to the downloads folder or wherever no machine was downloaded
click the "open terminal here"

then type "sudo dpkg -i no"

after typing "no" hit the tab button and that will autofill the rest. This only works if their isnt another file in the same folder that starts with no. hence why you delete everything in the downloads folder

Lenovo T420 will not work for machine control at all dues to very bad power saving options built in.
The latency was terrible on mine, did you check yours?