First of all, don't panic! Please provide more information: what version of obuntu are running? What did you use to try and install(apt-get, Software Center)? -------------- Amichai. <div class="gmail_quote">On Nov 30, 2011 12:59 PM, "Shawn Pringle" <<a href="mailto:shawn.pringle@gmail.com">shawn.pringle@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Before installing samba, I received this warning: "The following packages cannot be authenticated!" I didn't know there was any kind of certificate system in place. Can someone tell me what this means exactly, how serious is the risk and why common are packages that can be authenticated? Shawn Pringle - -- PGP public key available at <a href="http://pool.sks-keyservers.net" target="_blank">pool.sks-keyservers.net</a> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) iQEcBAEBAgAGBQJO1gwPAAoJEHJVLFhKYbxVkuUH/iNnvT0zlBrFN4JG6R+oU/NF Pl+GxRf2yo/OtTGhJznZjtSYHU3Bn7sDebFUcvZ+uTJ//IB40FT+2JRywAgMAGUN jEZgx9uMJW6pTX15T5tUeQk/02d4pO/+dJ29SVqqg56eqtXcsEKpqQNpMOUL+XBN QGw3LsdDwV+owFpYMzJLyEJUaW+f+UHkquguLqR0n/DXB5WLDGorDz/r71PLIaBG ciG7e4CGTF89zaiqziLfTwSfYdEpl6nJWOzQYMqwAcmNxAYNX4fAJadnvymUPAlq VLsU5F6niCJy+CjvWVn4xOORRwQkWSio2tvPYrMOjQpaaFmdyqKfrdyPkBVaGQI= =Lywi -----END PGP SIGNATURE----- -- ubuntu-users mailing list <a href="mailto:ubuntu-users@lists.ubuntu.com">ubuntu-users@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-users</a> </blockquote></div>