"cannot find package" when building or installing through go install command

[ForumPlayer]

When I try to build with go build -o log4jscanner, I always get this:

log4jscanner.go:26:2: cannot find package "github.com/google/log4jscanner/jar" in any of:
        /usr/lib/go-1.10/src/github.com/google/log4jscanner/jar (from $GOROOT)
        /home/fp/go/src/github.com/google/log4jscanner/jar (from $GOPATH)
log4jscanner_linux.go:22:2: cannot find package "golang.org/x/sys/unix" in any of:
        /usr/lib/go-1.10/src/golang.org/x/sys/unix (from $GOROOT)
        /home/fp/go/src/golang.org/x/sys/unix (from $GOPATH)
log4jscanner.go:21:2: cannot find package "io/fs" in any of:
        /usr/lib/go-1.10/src/io/fs (from $GOROOT)
        /home/fp/go/src/io/fs (from $GOPATH)

but if I try to install through go install github.com/google/log4jscanner@latest

can't load package: package github.com/google/log4jscanner@latest: cannot find package "github.com/google/log4jscanner@latest" in any of:
        /usr/lib/go-1.10/src/github.com/google/log4jscanner@latest (from $GOROOT)
        /home/fp/go/src/github.com/google/log4jscanner@latest (from $GOPATH)

I'm using elementary OS 5.1.7 (based on Ubuntu 18.04.6 LTS), and my go installation is basically only those packages:

golang-go/bionic,now 2:1.10~4ubuntu1 amd64 [installed]
golang-1.10-go/bionic-security,bionic-updates,now 1.10.4-2ubuntu1~18.04.2 amd64 [installed,automatic]
golang-1.10-race-detector-runtime/bionic,now 0.0+svn285455-0ubuntu1 amd64 [installed,automatic]
golang-1.10-src/bionic-security,bionic-updates,now 1.10.4-2ubuntu1~18.04.2 amd64 [installed,automatic]
golang-docker-credential-helpers/bionic-updates,now 0.5.0-2ubuntu0.1 amd64 [installed,automatic]
golang-race-detector-runtime/bionic,now 2:1.10~4ubuntu1 amd64 [installed,automatic]
golang-src/bionic,now 2:1.10~4ubuntu1 amd64 [installed,automatic]

[ericchiang]

This project uses features from go1.17. you'll need to update your go installation and use modules to build from source

https://go.dev/ref/mod