Same computer in use and slint has no problem running nmtui and connecting to the wifi network here.
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I'd normally use reportbug to report this except nmtui is preventing that
from happening. The version in use is on debian-mac-9.4.0 disk and I used
that version since the system is too old for efi or uefi. I was able to
edit my wifi connection and save the connection with all fields filled in
correctly. I just couldn't activate the connection once that had got
done. If there's a later version of nmtui or the package in which nmtui
comes on the standard debian netinst disk I'll try that and see if things
improve. When the activation failed, it's like the device and connection
were invisible and didn't show up on the screen if that helps.
