I've an error when i try to launch Synaptic Package Manager.
I've installed Hadoop single cluster following this guide
https://tecadmin.net/setup-hadoop-single-node-cluster-on-centos-redhat/
and also this
http://www.bogotobogo.com/Hadoop/BigData_hadoop_Install_on_ubuntu_single_node_cluster.php
I login to Debian 8 with as a defaultuser, click on APT and window ask me the hadoopuser password.
If i switch Debian user (hadoopuser) and try to click on APT the window ask me the same password for hadoopuser again.
Defaultuser has a group, hadoopuser has another group.
Why APT don't ask me the password for the user that i'm using?
NB: when i login into Debian i've 2 user: defaultuser and hadoopuser. This work fine.