rtd_oem_release_upgrade() {
# Description: Function to attempt to perform a release upgade on several Linux distributions.
# Supported distributions are: Ubuntu, Pop! OS, Debian, SUSE, and fedora.
# This function does not require any arguments but will respect "interactive". The "interactive"
# parameter will force the function to pause if a supported distribution is not found.
# It will check for a supported distribution and attempt the upgrade if possible.
# If a supported distribution is not detected the function will do nothing.
#
# Globals:
# Arguments: None
# Outputs:
# Returns:
# Usage:  (in a script):
#  rtd_oem_release_upgrade [ string ]
#
# [ string ] : interactive
#
# End of Documentation


    ensure_admin
    local interactive=$1
    local distro=$(hostnamectl | grep -Eo 'Ubuntu|Pop!_OS|Debian|SUSE|fedora|TUXEDO|Zorin')

    case $distro in
        "Ubuntu"|"Pop!_OS"|"TUXEDO|Zorin")
            # Common update steps for Ubuntu and derivativres
            write_warning "This may take some time, please be patient!"
            apt clean && apt update -m ; dpkg --configure -a ; apt install -f ; apt dist-upgrade ; apt autoremove --purge
            if [[ "$interactive" == "interactive" ]]; then
                $RTD_GUI --title "$distro Distribution Upgrade Confirmation" --yesno "Please confirm that you want to upgrade to the next version of $distro. This may take some time, please be patient!" 8 78
                case $? in
                0 ) do-release-upgrade | tee -a ${_LOGFILE} ;;
                1|255 ) return 1 ;;
                esac
            else
                do-release-upgrade --quiet | tee -a ${_LOGFILE}
            fi
        ;;
        "Debian")
            write_error "Debian does not provide an upgrade tool between major releases. Please use the manual upgrade method."
            return 1
        ;;
        "SUSE")
            # SUSE upgrade steps
            if current_version=$(cat /etc/os-release | grep VERSION_ID | cut -d '"' -f2) ; then
                write_status "Current SUSE version: $current_version"
            else
                write_error "unable to query /etc/os-release for current version of SUSE! "
                return 1
            fi

            if latest_version=$(curl -s https://download.opensuse.org/distribution/openSUSE-current/iso/ | grep -Eo '1[5-9]\.[0-9]|20\.[0-9]+' | sort -V | tail -n1) ; then
                write_status "Latest SUSE version: $latest_version"
            else
                write_error "unable to query opensuse.org for latest version of SUSE! Check access to internet and try again."
                return 1
            fi

            if [ "$(printf '%s\n' "$current_version" "$latest_version" | sort -V | head -n1)" != "$current_version" ]; then
                write_status "A newer version of SUSE is available: $latest_version"
                write_warning "This REALLY may take some time, please be patient!"
                write_information "These are the current repositories:"
                {
                    zypper repos --uri
                    zypper modifyrepo --enable repo-update
                    zypper repos --uri
                    zypper refresh
                } | tee -a ${_LOGFILE}

                write_status "Checking if it is possible to upgrade to ${SUSE_VER}"
                if zypper --releasever="${SUSE_VER}" lr -u ; then
                    zypper --releasever="${SUSE_VER}" ref
                    write_status "Attempting upgrade of system now..."
                    zypper --releasever="${SUSE_VER}" dup --force-resolution
                    wait
                    [[ "$interactive" == "interactive" ]] && read -p "$ERRMSG: Press  [ ENTER ] to REBOOT:"
                    reboot
                else
                    write_error "It is not possible to upgrade to Open Suse ${SUSE_VER} since there does not appear to be a release server available for ${SUSE_VER}"
                    [[ "$interactive" == "interactive" ]] && read -p "$ERRMSG: Press  [ ENTER ] to continue:"
                fi
            else
                write_information "You are using the latest version of SUSE: $current_version"
                [[ "$interactive" == "interactive" ]] && read -p "$ERRMSG: Press  [ ENTER ] to continue:"
            fi
        ;;
        "fedora")
            # Fedora upgrade steps
            if [[ "$interactive" == "interactive" ]]; then
                latest_version=$(curl -s https://dl.fedoraproject.org/pub/fedora/linux/releases/ | cut -d' ' -f5 |grep -Eo '[0-9][5-9]' | sort -V | tail -n1)
                releasever=$($RTD_GUI --title "Fedora Distribution Upgrade Confirmation" \
                    --inputbox "Please enter the Fedora version you want to upgrade to. Latest version is . Current version: $latest_version $(hostnamectl | grep -oP '(?<=Operating System: Fedora\s)\d+')\nOnly numbers are valid." 10 78 3>&1 1>&2 2>&3)
            else
                releasever=$(curl -s https://dl.fedoraproject.org/pub/fedora/linux/releases/ | cut -d' ' -f5 |grep -Eo '[0-9][5-9]' | sort -V | tail -n1)
            fi

            # Validate input
            if [[ ! $releasever =~ ^[0-9]+$ ]]; then
                write_error "Invalid version number. Upgrade aborted."
                return 1
            fi

            # Upgrade process
            write_status "Starting upgrade process for Fedora. This may take some time."
            {
                dnf clean all
                dnf upgrade --refresh -y
                dnf install dnf-plugin-system-upgrade -y
                if ! dnf system-upgrade download --refresh --releasever="${releasever}"; then
                    write_error "Failed to download system upgrade packages."
                    return 1
                fi
            } | tee -a ${_LOGFILE}

            # Confirmation for reboot
            if [[ "$interactive" == "interactive" ]]; then
                read -p "$ERRMSG: Press [ ENTER ] to REBOOT and install the upgrade:"
            fi

            # Rebooting to apply upgrade
            dnf system-upgrade reboot
            return $?
        ;;
        *)
        system::log_item "This distribution is not supported for release upgrade."
        [[ "$interactive" == "interactive" ]] && read -p "This distribution is not supported. Press [Enter] key to return to menu."
        return 1
        ;;
    esac
    return

}