How to login with opensshkey on ubuntu terminal

Locate to dirctory in which ppk file exist

cd /home

and run the below command

puttygen web.ppk -O private-openssh -o my-openssh-keyD

now you can see my-openssh-key file in your directory. again run a command

sudo ssh -v root@123.456.8.99 -i my-openssh-key

now you will login with ssh key