hold pacotes

fazer:
echo xserver-xorg hold | dpkg --set-selections

desfazer:
echo xserver-xorg install | dpkg --set-selections

ver pacotes em hold:
aptitude search ~ahold

letsencrypt nginx

git clone https://github.com/letsencrypt/letsencrypt /opt/letsencrypt
cd /opt/letsencrypt
./letsencrypt-auto certonly -a webroot --webroot-path=/var/www/aefm -d aefm.pt -d www.aefm.pt -d museu.aefm.pt -d w3.aefm.pt

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