Question

Why does fresh Debian 10 image fail apt update

Fresh Debian 10 image, running apt update gives repository errors:

Ign:1 http://mirrors.digitalocean.com/ubuntu buster InRelease
Ign:2 http://mirrors.digitalocean.com/ubuntu buster-updates InRelease
Ign:3 http://mirrors.digitalocean.com/ubuntu buster-backports InRelease
Err:4 http://mirrors.digitalocean.com/ubuntu buster Release
  404  Not Found [IP: 2606:4700:30::6818:74d1 80]
Err:5 http://mirrors.digitalocean.com/ubuntu buster-updates Release
  404  Not Found [IP: 2606:4700:30::6818:74d1 80]
Err:6 http://mirrors.digitalocean.com/ubuntu buster-backports Release
  404  Not Found [IP: 2606:4700:30::6818:74d1 80]
Ign:7 http://security.ubuntu.com/ubuntu buster-security InRelease
Err:8 http://security.ubuntu.com/ubuntu buster-security Release
  404  Not Found [IP: 2001:67c:1360:8001::17 80]
Reading package lists... Done
E: The repository 'http://mirrors.digitalocean.com/ubuntu buster Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://mirrors.digitalocean.com/ubuntu buster-updates Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://mirrors.digitalocean.com/ubuntu buster-backports Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://security.ubuntu.com/ubuntu buster-security Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
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apt-get update --allow-releaseinfo-change
Ign:1 cdrom://[Debian GNU/Linux 10.2.0 _Buster_ - Official amd64 DVD Binary-1 20191116-09:57] buster InRelease
Err:2 cdrom://[Debian GNU/Linux 10.2.0 _Buster_ - Official amd64 DVD Binary-1 20191116-09:57] buster Release
  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit:3 http://nginx.org/packages/debian buster InRelease
Get:4 http://security.debian.org/debian-security buster/updates InRelease [65.4 kB]
Get:5 http://security.debian.org/debian-security buster/updates/main Sources [93.4 kB]
Get:6 http://security.debian.org/debian-security buster/updates/main amd64 Packages [162 kB]
Get:7 http://security.debian.org/debian-security buster/updates/main Translation-en [83.6 kB]
Hit:8 http://deb.debian.org/debian buster InRelease
Get:9 http://deb.debian.org/debian buster-updates InRelease [49.3 kB]
Reading package lists... Done
E: The repository 'cdrom://[Debian GNU/Linux 10.2.0 _Buster_ - Official amd64 DVD Binary-1 20191116-09:57] buster Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

and when i run the curl -sSL https://install.pi-hole.net |bash

this keeps failing.

[✓] Disk space check
  [✗] Update local cache of available packages
  Error: Unable to update package cache. Please try "apt-get update"root@go-doh:~#

This question was answered by @CanadaGuy:

I just tried a new Droplet from scratch and it seems to work fine. The above error resulted from a droplet that was originally Ubuntu 18.04, but rebuilt with Debian 10.

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