I followed the steps listed to determine what version of PureOS I have. I believe I also have Byzantium so I thought your steps might work here for me. Things seemed to be working until I enter the second line for what you list under “Then download the package from Debian and install it”. It seems to end with an error related to the “dependencies” but I thought those were installed in the first step.
Also, I don’t know if that error I got after the first command - “package has no installation candidate” was to be expected or if that also indicates something has gone wrong.
dbrokaw@DRBL14:~$ sudo apt install build-essential debconf-2.0 debhelper dh-autoreconf wget devscripts libcap2-bin
[sudo] password for dbrokaw:
Reading package lists… Done
Building dependency tree… Done
Reading state information… Done
Package debconf-2.0 is a virtual package provided by:
debconf 1.5.77
cdebconf 0.260
You should explicitly select one to install.
E: Package ‘debconf-2.0’ has no installation candidate
dbrokaw@DRBL14:~$ wget http://ftp.us.debian.org/debian/pool/contrib/libd/libdvd-pkg/libdvd-pkg_1.4.2-1-1_all.deb
–2021-12-12 13:06:36-- http://ftp.us.debian.org/debian/pool/contrib/libd/libdvd-pkg/libdvd-pkg_1.4.2-1-1_all.deb
Resolving ftp.us.debian.org (ftp.us.debian.org)… 64.50.236.52, 208.80.154.15, 64.50.233.100, …
Connecting to ftp.us.debian.org (ftp.us.debian.org)|64.50.236.52|:80… connected.
HTTP request sent, awaiting response… 200 OK
Length: 15700 (15K) [application/x-troff-man]
Saving to: ‘libdvd-pkg_1.4.2-1-1_all.deb’
libdvd-pkg_1.4.2-1- 100%[===================>] 15.33K --.-KB/s in 0.07s
2021-12-12 13:06:37 (229 KB/s) - ‘libdvd-pkg_1.4.2-1-1_all.deb’ saved [15700/15700]
dbrokaw@DRBL14:~$ sudo dpkg -i libdvd-pkg_1.4.2-1-1_all.deb
(Reading database … 252979 files and directories currently installed.)
Preparing to unpack libdvd-pkg_1.4.2-1-1_all.deb …
Unpacking libdvd-pkg (1.4.2-1-1) over (1.4.2-1-1) …
dpkg: dependency problems prevent configuration of libdvd-pkg:
libdvd-pkg depends on debhelper (>= 9); however:
Package debhelper is not installed.
libdvd-pkg depends on dh-autoreconf; however:
Package dh-autoreconf is not installed.
dpkg: error processing package libdvd-pkg (–install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
libdvd-pkg
dbrokaw@DRBL14:~$