Remove obsolete DEB package name checks

The installer contains three checks for specific DEB package names, which did change in past Debian/Ubuntu versions. These checks are obsolete with the current set of supported distro versions:

iproute vs iproute2: All distro versions down to Debian Jessie and Ubuntu Xenial ship the iproute2 package:
- https://packages.debian.org/search?keywords=iproute
- https://packages.ubuntu.com/search?suite=all&keywords=iproute

php5 vs php: None of the Ubuntu version down to Xenial and only Debian Jessie ships the php5 package:
- https://packages.debian.org/search?keywords=php5
- https://packages.ubuntu.com/search?suite=all&keywords=php5
Moreover, installs with PHP5 would fail anyway for a longer time, due to the added php-xml module package, which became a dedicated package with PHP7.0 while being part of the core package with PHP5:
- https://packages.debian.org/search?keywords=php5-xml

php-sqlite vs php-sqlite3: With PHP7, the SQLite module package name changed to sqlite3 prefix:
- https://packages.debian.org/search?keywords=php-sqlite
- https://packages.ubuntu.com/search?suite=all&keywords=php-sqlite

Additionally the code comment about minimal apt-get call output was moved to the actual apt-get install call section, as if refers to issues with package installs that require interactive action and hence output about it to the console. The package cache update as well requires an interactive confirmation when the underlying suite code name changes, e.g. when "buster" becomes "oldstable" and "bullseye" becomes "stable". But that is not what the referred issue was about.

The comments around the installer and Pi-hole package dependencies have been aligned with the current v6 branch as attempt to resolve merge conflicts in the first place.

Signed-off-by: MichaIng <micha@dietpi.com>

automated install/basic-install.sh

@@ -273,66 +273,25 @@ if is_command apt-get ; then
     PKG_INSTALL=("${PKG_MANAGER}" -qq --no-install-recommends install)
     # grep -c will return 1 if there are no matches. This is an acceptable condition, so we OR TRUE to prevent set -e exiting the script.
     PKG_COUNT="${PKG_MANAGER} -s -o Debug::NoLocking=true upgrade | grep -c ^Inst || true"
-    # Update package cache. This is required already here to assure apt-cache calls have package lists available.
+    # Update package cache
     update_package_cache || exit 1
-    # Debian 7 doesn't have iproute2 so check if it's available first
-    if apt-cache show iproute2 > /dev/null 2>&1; then
-        iproute_pkg="iproute2"
-    # Otherwise, check if iproute is available
-    elif apt-cache show iproute > /dev/null 2>&1; then
-        iproute_pkg="iproute"
-    # Else print error and exit
-    else
-        printf "  %b Aborting installation: iproute2 and iproute packages were not found in APT repository.\\n" "${CROSS}"
-        exit 1
-    fi
     # Check for and determine version number (major and minor) of current php install
+    local phpVer="php"
     if is_command php ; then
         printf "  %b Existing PHP installation detected : PHP version %s\\n" "${INFO}" "$(php <<< "<?php echo PHP_VERSION ?>")"
         printf -v phpInsMajor "%d" "$(php <<< "<?php echo PHP_MAJOR_VERSION ?>")"
         printf -v phpInsMinor "%d" "$(php <<< "<?php echo PHP_MINOR_VERSION ?>")"
-        # Is installed php version 7.0 or greater
-        if [ "${phpInsMajor}" -ge 7 ]; then
-            phpInsNewer=true
-        fi
-    fi
-    # Several other packages depend on the version of PHP. If PHP is not installed, or an insufficient version,
-    # those packages should fall back to the default (latest?)
-    if [[ "$phpInsNewer" != true ]]; then
-        # Prefer the php metapackage if it's there
-        if apt-cache show php > /dev/null 2>&1; then
-            phpVer="php"
-        # Else fall back on the php5 package if it's there
-        elif apt-cache show php5 > /dev/null 2>&1; then
-            phpVer="php5"
-        # Else print error and exit
-        else
-            printf "  %b Aborting installation: No PHP packages were found in APT repository.\\n" "${CROSS}"
-            exit 1
-        fi
-    else
-        # Else, PHP is already installed at a version beyond v7.0, so the additional packages
-        # should match version with the current PHP version.
         phpVer="php$phpInsMajor.$phpInsMinor"
     fi
-    # We also need the correct version for `php-sqlite` (which differs across distros)
-    if apt-cache show "${phpVer}-sqlite3" > /dev/null 2>&1; then
-        phpSqlite="sqlite3"
-    elif apt-cache show "${phpVer}-sqlite" > /dev/null 2>&1; then
-        phpSqlite="sqlite"
-    else
-        printf "  %b Aborting installation: No SQLite PHP module was found in APT repository.\\n" "${CROSS}"
-        exit 1
-    fi
     # Packages required to perfom the os_check (stored as an array)
     OS_CHECK_DEPS=(grep dnsutils)
     # Packages required to run this install script (stored as an array)
-    INSTALLER_DEPS=(git "${iproute_pkg}" whiptail ca-certificates)
+    INSTALLER_DEPS=(git iproute2 whiptail ca-certificates)
     # Packages required to run Pi-hole (stored as an array)
     PIHOLE_DEPS=(cron curl iputils-ping lsof netcat psmisc sudo unzip idn2 sqlite3 libcap2-bin dns-root-data libcap2)
     # Packages required for the Web admin interface (stored as an array)
     # It's useful to separate this from Pi-hole, since the two repos are also setup separately
-    PIHOLE_WEB_DEPS=(lighttpd "${phpVer}-common" "${phpVer}-cgi" "${phpVer}-${phpSqlite}" "${phpVer}-xml" "${phpVer}-intl")
+    PIHOLE_WEB_DEPS=(lighttpd "${phpVer}-common" "${phpVer}-cgi" "${phpVer}-sqlite3" "${phpVer}-xml" "${phpVer}-intl")
     # Prior to PHP8.0, JSON functionality is provided as dedicated module, required by Pi-hole AdminLTE: https://www.php.net/manual/json.installation.php
     if [[ "${phpInsNewer}" != true || "${phpInsMajor}" -lt 8 ]]; then
         PIHOLE_WEB_DEPS+=("${phpVer}-json")
@@ -1555,9 +1514,6 @@ disable_resolved_stublistener() {
 }
 
 update_package_cache() {
-    # Running apt-get update/upgrade with minimal output can cause some issues with
-    # requiring user input (e.g password for phpmyadmin see #218)
-
     # Update package cache on apt based OSes. Do this every time since
     # it's quick and packages can be updated at any time.
 
@@ -1622,6 +1578,8 @@ install_dependent_packages() {
         # If there's anything to install, install everything in the list.
         if [[ "${#installArray[@]}" -gt 0 ]]; then
             test_dpkg_lock
+            # Running apt-get install with minimal output can cause some issues with
+            # requiring user input (e.g password for phpmyadmin see #218)
             printf "  %b Processing %s install(s) for: %s, please wait...\\n" "${INFO}" "${PKG_MANAGER}" "${installArray[*]}"
             printf '%*s\n' "$columns" '' | tr " " -;
             "${PKG_INSTALL[@]}" "${installArray[@]}"