could not install on wsl windows 10

[zawsx]

Other go packages install OK
after:
go get github.com/jsha/minica
I get:

package bytes: unrecognized import path "bytes" (import path does not begin with hostname)
package crypto: unrecognized import path "crypto" (import path does not begin with hostname)
package crypto/rand: unrecognized import path "crypto/rand" (import path does not begin with hostname)
package crypto/rsa: unrecognized import path "crypto/rsa" (import path does not begin with hostname)
package crypto/x509: unrecognized import path "crypto/x509" (import path does not begin with hostname)
package crypto/x509/pkix: unrecognized import path "crypto/x509/pkix" (import path does not begin with hostname)
package encoding/hex: unrecognized import path "encoding/hex" (import path does not begin with hostname)
package encoding/pem: unrecognized import path "encoding/pem" (import path does not begin with hostname)
package flag: unrecognized import path "flag" (import path does not begin with hostname)
package fmt: unrecognized import path "fmt" (import path does not begin with hostname)
package io/ioutil: unrecognized import path "io/ioutil" (import path does not begin with hostname)
package log: unrecognized import path "log" (import path does not begin with hostname)
package math: unrecognized import path "math" (import path does not begin with hostname)
package math/big: unrecognized import path "math/big" (import path does not begin with hostname)
package net: unrecognized import path "net" (import path does not begin with hostname)
package os: unrecognized import path "os" (import path does not begin with hostname)
package strings: unrecognized import path "strings" (import path does not begin with hostname)
package time: unrecognized import path "time" (import path does not begin with hostname)