Unsupported OS; cant skip OS check

(I reformated your post for better readability)

Dig returned sucessfully the list of supported OS. So the installe should not fail silently.

Please try

curl -sSL https://install.pi-hole.net | PIHOLE_SKIP_OS_CHECK=true sudo -E bash
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root@chris:/home/chris# curl -sSL https://install.pi-hole.net | PIHOLE_SKIP_OS_CHECK=true sudo -E 
usage: sudo -h | -K | -k | -V
usage: sudo -v [-AknS] [-g group] [-h host] [-p prompt] [-u user]
usage: sudo -l [-AknS] [-g group] [-h host] [-p prompt] [-U user] [-u user] [command]
usage: sudo [-AbEHknPS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p prompt] [-T timeout]
            [-u user] [VAR=value] [-i|-s] [<command>]
usage: sudo -e [-AknS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p prompt] [-T timeout]
            [-u user] file ...
curl: (23) Failed writing body (1354 != 1371)

Failed I am afraid.

curl -sSL https://install.pi-hole.net | PIHOLE_SKIP_OS_CHECK=true sudo -E bash

The bash was missing.

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I am an idiot missing the bash!

Loads but not as it should.

Pi-hole diagnosis comes up with:

DataTables warning: table id=messagesTable - Invalid JSON response. For more information about this error, please see http://datatables.net/tn/1

Might be why it's unsupported, but I don't know offhand.

Please generate a debug token with pihole -d or via the web interface. If time permits, a moderator might have a look into your issue.

Unsupported means unsupported.

If you want to post the contents of the debug here, then that's fine. But developer's won't be looking at the logs.

Many thanks for suggestions made.

I did:

sudo su
PIHOLE_SKIP_OS_CHECK=true pihole -up

And it worked.

Great news, Can I assume that relied on you having Ver 4 running and was not a fresh install of 5?

No, I upgraded from v5.0 to v5.1
(Armbian Bionic, BPi M2U)

Thanks. This installed PiHole on Armbian on my Odroid XU4.

i am getting an error :

Could not resolve host: install.pi-hole.net

anybody gets the same message?

This.

Pihole went on to check update but it stopped on downloading and installing FTL:

[✓] Detected x86_64 architecture
[i] Checking for existing FTL binary...
[i] Downloading and Installing FTL...curl: (6) Could not resolve host: github.com
[✗] Downloading and Installing FTL
Error: URL https://github.com/pi-hole/ftl/releases/latest/download/pihole-FTL-linux-x86_64 not found
[✗] FTL Engine not installed

Unable to complete update, please contact Pi-hole Support

This will temporarily reset the nameserver on the Pi to bypass Pi-Hole DNS.

sudo nano /etc/resolv.conf

edit nameserver 127.0.0.1 to nameserver 9.9.9.9 or your preferred third party DNS service, save and exit

Run the long form updater again.

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