Hi Terry,

> I've just created a brand new, clean installation of Raspberry Pi OS
> four more times.  Apart from changing the password, hostname and
> enabling I2C and SSH in each case, I've done nothing more than run
> through the tutorial at
> https://www.electromaker.io/tutorial/blog/raspberry-pi-vpn-server as
> before.
>
> Everything worked fine, but when I got to installing wireguard, I got
> exactly the same result as yesterday, eg:
>
> ln: failed to create hard link
>     '/boot/initrd.img-5.6.0-2-rt-armmp.dpkg-bak' =>
>     '/boot/initrd.img-5.6.0-2-rt-armmp': Operation not permitted

Raspbian is based on Debian 10, Buster, according to
https://en.wikipedia.org/wiki/Raspbian#Version_history and Debian 10 is
stable, says https://en.wikipedia.org/wiki/Debian_releases#Release_table
yet your tutorial does

    Now, add the WireGuard repository to your trusted sources list:

        echo "deb http://deb.debian.org/debian/ unstable main" |
        sudo tee --append /etc/apt/sources.list.d/unstable.list

Mixing Debian's unstable into Raspbian-based-on-Debian-stable is
worrying.  Perhaps that's out of date and could be stable now.  I don't
know.

> On the third and fourth attempts I tried to run the Tutorials at:
>
> https://engineerworkshop.com/blog/how-to-set-up-wireguard-on-a-raspberry-pi/

It says

    echo "deb http://deb.debian.org/debian/ unstable main" |
    sudo tee --append /etc/apt/sources.list

> That failed due to duff keys.
>
> and
>
> https://www.ovpn.com/en/guides/wireguard/raspberry-pi-raspbian

It too.

    sudo -i
    echo "deb http://deb.debian.org/debian/ unstable main" 
>/etc/apt/sources.list.d/unstable.list

> I think that anyone wanting to install wireguard on a Pi at the moment
> is probably better off waiting until it makes its way into the
> mainstream repository.

https://www.wireguard.com/compilation/ looks easy.  ;-)

-- 
Cheers, Ralph.

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