apt-get update:
W: GPG error: http://deb.opera.com stable Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY F9A2F76A9D1A0061
W: You may want to run apt-get update to correct these problems
hwu@hwu-laptop:~$ gpg –keyserver pgpkeys.mit.edu –recv-key F9A2F76A9D1A0061
gpg: requesting key 9D1A0061 from hkp server pgpkeys.mit.edu
gpg: key 9D1A0061: public key “Opera Software Archive Automatic Signing Key 2010 ” imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1
$ gpg –edit-key packager@opera.com
gpg (GnuPG) 1.4.9; Copyright (C) 2008 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
pub 1024D/9D1A0061 created: 2009-08-31 expires: 2011-01-23 usage: SC
trust: unknown validity: unknown
sub 4096g/87DEACAE created: 2009-08-31 expires: 2011-01-23 usage: E
[ unknown] (1). Opera Software Archive Automatic Signing Key 2010
Command> fpr
pub 1024D/9D1A0061 2009-08-31 Opera Software Archive Automatic Signing Key 2010
Primary key fingerprint: 8526 E45F AF83 DE2F 634C 1909 F9A2 F76A 9D1A 0061
gpg -a –export 9D1A0061 | sudo apt-key add -
OK
http://deb.opera.com/