My PPTP server is 192.168.1.139
My router IP is 192.168.1.1 (default)
I have connected in LAN port.
However, I am not able to connect client to server and I saw below kernel logs.
[ 1401.623847] pptp-vpn: renamed from ppp0
[ 1433.075903] pptp-vpn: renamed from ppp0
It starts by using an outdated release, which has been EOL for almost half a decade and out of (security- and otherwise) support (which does contain several well-known/ unfixed security issues) - and doesn't stop at trying pptp instead of a decent VPN solution (wireguard, IKEv2, OpenVPN, ...). Due to its age it also lacks several modern encryption ciphers that might be required by the other end of the connection.
Upgrade to 22.03.x or 23.05.0-rc3 first, now - even if that might imply upgrading the hardware alongside, in case if very low-end hardware (but you wouldn't get very far with the VPN capabilities of such devices anyways).