Ubuntu 20.04 failing to connect to CISCO 1941 router using SSH

I updated my PC from Ubuntu 18.04(Bionic Beaver) to Ubuntu 20.04(Focal Fossa) but the problem is that whenever I tried to connect to the CISCO router its failing saying the following:

Unable to negotiate with 172.16.100.65 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

HOW TO SOLVE THIS PROBLEM? THANKS IN ADVANCE!!!