Jenkins version still pointing to old version(2.440.3) using dpkg command but is on latest using .war file(2.492.3)
How to fix it ?
Please describe what operations you performed and their results. Your description is not enough for anyone to help you.
Debian and its derivatives use dpkg as the underlying tool that is used by the apt package manager to maintain packages. The Jenkins install instructions use apt-get to perform installations. You should not need to use dpkg directly, since apt will call it as necessary.