Download the latest stable version (at least 3.4.x or higher) from the Official Wireshark website. Version 3.6.5 and later are confirmed to support this type. 3. Manual Conversion (If you cannot update)
The standard repositories for older LTS versions often provide outdated Wireshark packages. You can use the Wireshark Developers PPA to get the latest stable build: -pcap network type 276 unknown or unsupported-