Err: /var/cache/debconf/config.dat is locked

au fait je suis entrain d'installer plesk 7 sous debian sarge

et j'ai ca :

2. [*] Tomcat Java Servlets support
23. [*] ColdFusion support for Plesk
24. [*] SiteBuilder and Sitebuilder module for Plesk

1) Next page; 2) Previous page; 0) Cancel installing
3) Toggle a component; 4) Select all; 5) Deselect all;
Type the number corresponding to the desired action and press Enter [1]: 1
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process
Lecture des listes de paquets...
Press <ENTER> to continue...
donc j cherche d'ou ca viens