#debian recovery
wpa_supplicant -B -i wlan0 -c <(wpa_passphrase "Your_SSID" Your_passphrase) && dhclient wlan0
ping 8.8.8.8 #check if the internet works
mkdir mountpoint
mount /dev/sdX mountpoint
cp -a mountpoint/home/user /path/to/somedir #make a backup of home directory
umount mountpoint
fsck /dev/sdX
mount /dev/sdX mountpoint
chroot mountpoint
sudo apt-get install --reinstall $(dpkg --get-selections | grep -v deinstall | cut -f1) #reinstall all packages