Archlinux common error

archlinux $ cat help_pacman.txt 


critic update:
sudo pacman -Sy bash gnupg readline

downgrade: // normaly the cache is not cleared

# cd /var/cache/pacman/pkg/
# pacman -U <file_name_of_the_package>


# key problems ?
sudo pacman -Sy archlinux-keyring
sudo pacman-key --refresh-keys 

# ncurses key problems ?
yaourt --m-arg "--skippgpcheck" -S ncurses5-compat-libs

# or ncurses shit:
gpg --keyserver pgp.mit.edu --recv-keys 702353E0F7E48EDB

# pacman already in use
rm /var/lib/pacman/db.lck -f


# install yaourt
# add this to /etc/pacman.conf
# $ pacman -Sy yaourt
[archlinuxfr]
SigLevel = Never
Server = http://repo.archlinux.fr/$arch