Sorry for the time-wasting post.
I reinstalled again (but only additionally jq, and not openresolv); and followed instructions about using: systemctl start wg-quick@… (instead of wg-quick up…). And it works.
Sorry for the time-wasting post.
I reinstalled again (but only additionally jq, and not openresolv); and followed instructions about using: systemctl start wg-quick@… (instead of wg-quick up…). And it works.