https://bugs.winehq.org/show_bug.cgi?id=40137
--- Comment #3 from Buck Shockley darkwingbuck13@gmail.com --- (In reply to Sebastian Lackner from comment #1)
schannel works fine when support is compiled-in, and when the necessary runtime dependencies are installed. Of course it could still be a wine bug, but you didn't provide any information, not even why you assume that the problem is related to schannel.
Please attach terminal output (as file attachment) as a first step.
I double-checked that libgnutls-dev and winbind were installed, which they both were. The program still doesn't run properly and only outputs the parts of the log prefixed with "schannel" when exiting the error box.
As for how I know it's schannel, the Truckers MP devs said that it was because of schannel.
https://forum.ets2mp.com/index.php?/topic/25576-wine-and-ets2mp/