It also requires Go version 1.11+
That could be the key bit of information, there. Apt-get installed 1.10.4. Will report back after upgrading.
Edit: No luck.
go version
go version go1.11.5 linux/arm
GO111MODULE=on go install github.com/cruzbit/cruzbit/wallet
go: cannot find main module; see 'go help modules'