L2TP Client Package For PBP

[tophneal]

You need to get the armhf package. The default Debian uses a 64bit kernel, but a 32bit userspace. That package is also for Bullseye, your Debian is Stretch. Stretch it seems does not have this in its repos, so you'll want to use the one from Sid: https://packages.debian.org/sid/network-manager-l2tp

Here's a link where someone outlines their install of this package to Stretch: https://thomask.sdf.org/blog/2018/01/16/...retch.html