sudo apt-get --purge install akonadi-backend-postgresql akonadi-backend-mysql-
akonadictl stop
rm -rf .config/akonadi
rm -rf .local/share/akonadi
cat > .config/akonadi/akonadiserverrc <<EOF
[%General]
Driver=QPSQL

[QPSQL]
Name=akonadi-wouter
Host=
Options=
StartServer=false
EOF
createdb akonadi-wouter