I ran pihole -r:
[i] Existing PHP installation detected : PHP version 7.3.11-1~deb10u1
[i] Repair option selected
[✓] Disk space check
[✓] Update local cache of available packages
[✓] Checking apt-get for upgraded packages... up to date!
[i] Installer Dependency checks...
[✓] Checking for dhcpcd5
[✓] Checking for git
[✓] Checking for iproute2
[✓] Checking for whiptail
[i] SELinux not detected
[i] Performing reconfiguration, skipping download of local repos
[✓] Resetting repository within /etc/.pihole...
[✓] Resetting repository within /var/www/html/admin...
[i] Main Dependency checks...
[✓] Checking for cron
[✓] Checking for curl
[✓] Checking for dnsutils
[✓] Checking for iputils-ping
[✓] Checking for lsof
[✓] Checking for netcat
[✓] Checking for psmisc
[✓] Checking for sudo
[✓] Checking for unzip
[✓] Checking for wget
[✓] Checking for idn2
[✓] Checking for sqlite3
[✓] Checking for libcap2-bin
[✓] Checking for dns-root-data
[✓] Checking for resolvconf
[✓] Checking for libcap2
[✓] Checking for lighttpd
[✓] Checking for php7.3-common
[✓] Checking for php7.3-cgi
[✓] Checking for php7.3-sqlite3
[✓] Checking for php7.3-xml
[✓] Checking for php7.3-intl
[✓] Enabling lighttpd service to start on reboot...
[✓] Checking for user 'pihole'
[i] FTL Checks...
[✓] Detected 32bit (i686) architecture
[i] Checking for existing FTL binary...
[i] Checksum of installed binary matches remote. No need to download!
/etc/.pihole/automated install/basic-install.sh: line 1937: usermod: command not found
[i] Testing if systemd-resolved is enabled
[i] Systemd-resolved is not enabled
[✓] Restarting lighttpd service...
[✓] Enabling lighttpd service to start on reboot...
[i] Restarting services...
[✓] Enabling pihole-FTL service to start on reboot...
[✓] Restarting pihole-FTL service...
[✓] Deleting existing list cache
[i] Pi-hole blocking is enabled
[i] Neutrino emissions detected...
[✓] Pulling blocklist source list into range
[i] Target: raw.githubusercontent.com (hosts)
[✓] Status: Retrieval successful
[i] Target: mirror1.malwaredomains.com (justdomains)
[✓] Status: Retrieval successful
[i] Target: sysctl.org (hosts)
[✓] Status: Retrieval successful
[i] Target: s3.amazonaws.com (simple_tracking.txt)
[✓] Status: Retrieval successful
[i] Target: s3.amazonaws.com (simple_ad.txt)
[✓] Status: Retrieval successful
[i] Target: hosts-file.net (ad_servers.txt)
[✓] Status: Retrieval successful
[✓] Consolidating blocklists
[✓] Extracting domains from blocklists
[i] Number of domains being pulled in by gravity: 147096
[✓] Removing duplicate domains
[i] Number of unique domains trapped in the Event Horizon: 124205
[i] Nothing to whitelist!
[i] Number of regex filters: 0
[✓] Parsing domains into hosts format
[✓] Cleaning up stray matter
[✓] Force-reloading DNS service
[✓] DNS service is running
[✓] Pi-hole blocking is Enabled
[i] The install log is located at: /etc/pihole/install.log
Update Complete!
Current Pi-hole version is v4.3.2-384-gbf01f72
Current AdminLTE version is v4.3.2-357-g3cac308
Current FTL version is vDev-ecbeb95