The latest beta download for Netgear (1.40.0.7997-b09370ecd) is uninstallable on ReadyNAS OS.
Here is output from attempting to install deb.
$ sudo dpkg -i plexmediaserver_1.40.0.7997-b09370ecd_amd64.deb
dpkg-deb: error: archive '/home/nicholi/installs/plexmediaserver_1.40.0.7997-b09370ecd_amd64.deb' uses unknown compression for member 'control.tar.zst', giving up
dpkg: error processing archive /home/nicholi/installs/plexmediaserver_1.40.0.7997-b09370ecd_amd64.deb (--install):
subprocess dpkg-deb --control returned error exit status 2
Errors were encountered while processing:
/home/nicholi/installs/plexmediaserver_1.40.0.7997-b09370ecd_amd64.deb
Last working deb I was using was: plexmediaserver_1.40.0.7775-456fbaf97_amd64.deb
Zstd compression wasn’t added to Debian until dpkg v1.21.18. This was implemented in Debian 12. However Netgear’s ReadyNAS OS is still running Debian 8 (Jessie) and has dpkg v1.17.28. Yes I know its fantastically and terribly outdated, not much choice here though using Netgear. Unsure if there is a path to getting a more recent version of dpkg available which supports zstd compression on it. Or even just zstd package.
We can easily re-package the deb on another system to use xz compression, whilst waiting for eventual fix.
plexdeb="plexmediaserver_1.40.0.7997-b09370ecd_amd64.deb"
plexdir="${plexdeb%.deb}_fixing"
mkdir -p "${plexdir}"
ar x --output "${plexdir}/" "${plexdeb}"
for file in "${plexdir}/"*.zst; do zstd -d < "${file}" | xz > "${file%.zst}.xz"; done
ar -m -c -a sdsd "${plexdeb%.deb}_fixed.deb" "${plexdir}/debian-binary" "${plexdir}/"*.xz
