docs: Issue encountered on page Install ScyllaDB Manager

[snyaupaneHP]

Possible outdated Scylla Manager APT signing key in installation documentation

Description

While installing Scylla Manager from the official APT repository on Ubuntu, I encountered a repository signature verification error when following the documented GPG key import procedure.

I wanted to confirm whether:

• I am missing a required step, or
• the documentation currently references an outdated signing key / outdated import method.

What I followed

I used the documented key import approach:

sudo gpg --homedir /tmp \
  --no-default-keyring \
  --keyring /etc/apt/keyrings/scylladb.gpg \
  --keyserver hkp://keyserver.ubuntu.com:80 \
  --recv-keys A43E06657BAC99E3

Then:

sudo apt update

Error received

Get:5 https://downloads.scylladb.com/downloads/scylla-manager/deb/ubuntu/scylladb-manager-3.10 stable InRelease [7550 B]

Err:5 https://downloads.scylladb.com/downloads/scylla-manager/deb/ubuntu/scylladb-manager-3.10 stable InRelease
  The following signatures couldn't be verified because the public key is not available:
  NO_PUBKEY C503C686B007F39E

W: GPG error:
https://downloads.scylladb.com/downloads/scylla-manager/deb/ubuntu/scylladb-manager-3.10 stable InRelease:
The following signatures couldn't be verified because the public key is not available:
NO_PUBKEY C503C686B007F39E

E: The repository
'https://downloads.scylladb.com/downloads/scylla-manager/deb/ubuntu/scylladb-manager-3.10 stable InRelease'
is not signed.

What worked instead

Importing key:

C503C686B007F39E

worked successfully.

Commands used:

sudo gpg --homedir /tmp \
  --no-default-keyring \
  --keyring /tmp/temp.gpg \
  --keyserver hkp://keyserver.ubuntu.com:80 \
  --recv-keys C503C686B007F39E

sudo gpg --homedir /tmp \
  --no-default-keyring \
  --keyring /tmp/temp.gpg \
  --export --armor C503C686B007F39E | \
  gpg --dearmor | \
  sudo tee /etc/apt/keyrings/scylladb.gpg >/dev/null

After this:

sudo apt update

worked correctly.

Question

Is the currently documented key (A43E06657BAC99E3) outdated for the Scylla Manager repository?

Also, should the documentation recommend the newer Debian/Ubuntu keyring workflow:

recv-keys -> export -> dearmor

instead of writing directly into /etc/apt/keyrings/*.gpg using --recv-keys?