@jjconstr Ok firstly have you enabled developer mode on the nexus 5 (normally taping the build number in System Settings, About) then mtp transfer and android debugging and you need to install adb on your Mint OS ( full instructions on the web) Then restart the installer and follow the instructions. Back later bysy for awhile now.
EDIT:Nearly forgot check bootloader is unlocked though it may well be on the N5 also the installer may do it now too.
Thanks for the memory jog. After following the steps outlined in your latest post, installation went smoothly. I believe the installer did unlock the bootloader. I appreciate the ubports community. Being Google free is what freedom is all about!