I recently bought a Lenovo 100s as a lightweight, portable, cheap pc. First step was to clean it and install Ubuntu but I've run into some problems. Firstly they have installed 32 bit Windows and a 32 bit EFI on the machine even though it has 64 bit architecture. The EFI also has no legacy support, so I need a 32 bit ubuntu with EFI support (although I want 64 bit since the hardware supports it). PC has no dvd drive or LAN port, so those boot options are not possible. Anyone have any ideas? I'm a bit of a linux scrub so a step by step would be much appreciated if possible. Thanks!
I also have a Lenovo Thinkpad 100 (not sure about the 's') and previously replaced the Win10 OS with Ubuntu 14.04 LTS 64-bit (I've just upgraded to 16.04). I created a bootable USB using Universal USB Installer and booted from that (using the weird concealed boot button next to the headphone socket - I use an unfolded paperclip).
Hope that helps.