lilypond-git from older LilyDev

[Thomas Morley]

Hi,

for hunting a bug I revived an older LilyDev in Virtual Box (based on Debian-8).

To get access to GitLab (formerly git was connected to savannah) I did:
$ git remote set-url origin git@gitlab.com:lilypond/lilypond.git

And to update git I tried:
$ git fetch
->
The authenticity of host 'gitlab.com (172.65.251.78)' can't be established.
ECDSA key fingerprint is f1:d0:fb:46:73:7a:70:92:5a:ab:5d:ef:43:e2:1c:35.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'gitlab.com,172.65.251.78' (ECDSA) to the
list of known hosts.
Permission denied (publickey,keyboard-interactive).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.


What am I missing?


Cheers,
  Harm