'Couldn't connect to server' (github.com) on pihole -up

Static hostname: pihole
Icon name: computer
Machine ID: 11b3a35fc57b4ae19f24d325e6f22869
Boot ID: dca397d34a7c41f2a8fb7d672ec836e6
Operating System: Debian GNU/Linux 12 (bookworm)
Kernel: Linux 6.6.20+rpt-rpi-v8
Architecture: arm64

On typing pihole -up

I get the following
[i] SELinux not detected
[✓] Update local cache of available packages
[i] Existing PHP installation detected : PHP version 8.2.7

[✓] Checking apt-get for upgraded packages... up to date!

[i] Checking for / installing Required dependencies for OS Check...
[✓] Checking for grep
[✓] Checking for dnsutils

[✓] Supported OS detected
[i] Checking for / installing Required dependencies for this install script...
[✓] Checking for git
[✓] Checking for iproute2
[✓] Checking for dialog
[✓] Checking for ca-certificates

[i] Performing unattended setup, no dialogs will be displayed
[i] Performing reconfiguration, skipping download of local repos
[✓] Resetting repository within /etc/.pihole...
[✓] Resetting repository within /var/www/html/admin...
[i] Checking for / installing Required dependencies for Pi-hole software...
[✓] Checking for cron
[✓] Checking for curl
[✓] Checking for iputils-ping
[✓] Checking for psmisc
[✓] Checking for sudo
[✓] Checking for unzip
[✓] Checking for idn2
[✓] Checking for libcap2-bin
[✓] Checking for dns-root-data
[✓] Checking for libcap2
[✓] Checking for netcat-openbsd
[✓] Checking for procps
[✓] Checking for jq
[✓] Checking for lighttpd
[✓] Checking for php8.2-common
[✓] Checking for php8.2-cgi
[✓] Checking for php8.2-sqlite3
[✓] Checking for php8.2-xml
[✓] Checking for php8.2-intl

[✓] Enabling lighttpd service to start on reboot...
[✓] Checking for user 'pihole'

[i] FTL Checks...

[✓] Detected AArch64 (64 Bit ARM) processor
[i] Checking for existing FTL binary...
[i] Downloading and Installing FTL...curl: (28) Failed to connect to github.com port 443 after 139212 ms: Couldn't connect to server
[✗] Downloading and Installing FTL
Error: URL https://github.com/pi-hole/ftl/releases/latest/download/pihole-FTL-aarch64-linux-gnu not found
[✗] FTL Engine not installed

My output of ip route:

default via 192.168.1.1 dev eth0 proto dhcp src 192.168.1.4 metric 100
10.37.182.0/24 dev wg0 proto kernel scope link src 10.37.182.1
10.241.0.0/16 dev ztre4x2pjq proto kernel scope link src 10.241.211.81
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.4 metric 100

Please don't hijack other posts for observations with different symptoms.

I have moved your post to a separate topic.

Sorry, first time user of the system here.

Run from the machine hosting Pi-hole, what's the result of:

curl -LIk "https://github.com/pi-hole/ftl/releases/latest/download/pihole-FTL-aarch64-linux-gnu"

curl -LIk "https://github.com/pi-hole/ftl/releases/latest/download/pihole-FTL-aarch64-linux-gnu"
curl: (28) Failed to connect to github.com port 443 after 135191 ms: Couldn't connect to server

What does nslookup github.com return?

And for comparison, please also provide nslookup github.com 9.9.9.9.

;; communications error to 192.168.1.1#53: timed out
;; communications error to 192.168.1.1#53: timed out
;; communications error to 192.168.1.1#53: timed out
Server: 2001:a7ff:5f01::a
Address: 2001:a7ff:5f01::a#53

Non-authoritative answer:
Name: github.com
Address: 20.27.177.113
;; communications error to 192.168.1.1#53: timed out
;; communications error to 192.168.1.1#53: timed out
;; communications error to 192.168.1.1#53: timed out

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