Error There is no public key available for the following key IDs disebabkan oleh terhapusnya atau belum di import gpg dari key tersebut.
Berikut ini log errornya
Hit http://apt.newrelic.com newrelic Release.gpg Ign http://apt.newrelic.com/debian/ newrelic/non-free Translation-en Hit http://ftp.us.debian.org squeeze-updates/main amd64 Packages/DiffIndex Ign http://apt.newrelic.com/debian/ newrelic/non-free Translation-en_US Hit http://ftp.us.debian.org squeeze-updates/main amd64 Packages Hit http://apt.newrelic.com newrelic Release Hit http://apt.newrelic.com newrelic/non-free amd64 Packages Hit http://security.debian.org squeeze/updates Release.gpg Ign http://security.debian.org/ squeeze/updates/main Translation-en Ign http://security.debian.org/ squeeze/updates/main Translation-en_US Hit http://packages.dotdeb.org squeeze Release.gpg Ign http://packages.dotdeb.org/ squeeze/all Translation-en Ign http://packages.dotdeb.org/ squeeze/all Translation-en_US Hit http://security.debian.org squeeze/updates Release Hit http://packages.dotdeb.org squeeze Release Hit http://security.debian.org squeeze/updates/main Sources Hit http://packages.dotdeb.org squeeze/all amd64 Packages Hit http://security.debian.org squeeze/updates/main amd64 Packages Reading package lists... Done W: There is no public key available for the following key IDs: 8B48AD6246925553
untuk mengatasinya, bisa dengan dua cara berikut ini
gpg --keyserver pgp.mit.edu --recv-keys 8B48AD6246925553
output hasil eksekusi perintah diatas
gpg: requesting key 46925553 from hkp server pgp.mit.edu gpg: /root/.gnupg/trustdb.gpg: trustdb created gpg: key 46925553: public key "Debian Archive Automatic Signing Key (7.0/wheezy) <ftpmaster@debian.org>" imported gpg: no ultimately trusted keys found gpg: Total number processed: 1 gpg: imported: 1 (RSA: 1)
dan yang kedua adalah dengan cara menginstall aplikasi debian-keyring debian-archive-keyring
apt-get install debian-keyring debian-archive-keyring
selamat, masalahnya sudah teratasi.