I continued following the instructions in the thread linked above, and the command
# Export all installed packages to a text file in one line
eopkg li | cut -d " " -f 1 | tr '\n' ' ' > ~/InstalledPackages
does not seem to export ALL my installed packages. Here are the contents of the file:
aa-lsm-hook acl attr audit baselayout bash bash-completion bc bzip2 ca-certs clr-boot-manager comar comar-api coreutils cpio cryptsetup curl db5 dbus dbus-glib disktype e2fsprogs expat file findutils gawk gettext glib2 glibc gmp gobject-introspection gpm grep gzip hwdata inetutils inotify-tools isl iso-codes jansson json-c kerberos kernel-glue kmod less libcap2 libelf libffi libgcc libgcrypt libgomp libgpg-error libgudev libgusb libnettle libnspr libnss libpcre libpipeline libssh2 libstdc++ libusb libxml2 libxslt linux-driver-management lvm2 lz4 lzip mpc mpfr ncurses nghttp2 openssl openssl-11 pam piksemel pisi polkit popt procps-ng psmisc python python-dbus python-magic python-pycurl python-pyliblzma python-urlgrabber qol-assist readline sed shadow sharutils sqlite3 sudo systemd tar time tzdata unzip usbutils usysconf util-linux which wireless-regdb xz zip zlib
Note that none of my software is in that list. Firefox isn't there, neither is thunderbird, nor libreoffice etc etc..
Therefore, the rest of the instructions on that page (specifically this link ) don't work.