1. Copy files from one computer to another:
/etc/apt/sources.list /etc/apt/sources.list.d/*.*
2. Update package database:
sudo apt-get update
3. If there're errors about NO_PUBKEY, do followes steps for each key (replace key values with showed in step 2):
gpg --keyserver keyserver.ubuntu.com --recv 2EBC26B60C5A2783 sudo gpg --export --armor 2EBC26B60C5A2783 | sudo apt-key add -
Other key services:
keyserver.ubuntu.com pgp.mit.edu keyserver.pgp.com
4. Update package database again:
sudo apt-get update