Je pense que vous n’avez pas les droits d’accès nécessaires, donc voilà ce que vous devez faire :
1- Allez à : Système -> Administration -> Utilisateurs et groupes
2- cliquez sur déverrouiller ensuite entrez votre mot de passe.
3-cliquez sur : gérer les groupes
4-défilez en bas et sélectionnez vboxusers ensuite cliquez sur propriétés
5-Mettez 128 ou 127 dans ID de groupe
6-Cochez Tous les membres de groupes (Vous pouvez les cocher tous ou bien en choisir un ou deux selon le besoin)
7- Cliquez sur valider ensuite fermer
8-Redémarrer votre ordinateur
- To search something in all of the disk : locate "file or folder"
- To search something with path (word in all files) : find /path/to/dir/ | xargs grep --color "1234" -n find ../../ -name "*.c" | xargs grep --color "long"
or grep -r "1234" *
…
NB: for find : “-L” to follow the symbolic link; for grep “-r” <= recursive; "-n" <= display line number
- To search where is installed an executable on disk : which “software_name” $> which nautilus
/usr/bin/nautilus
With the Debian / Ubuntu distributions, the TFTP server configuration file is /etc/default/tftpd-hpa and by default it instructs the TFTP daemon to use the/var/lib/tftpboot directory to store its files. Also by default, the daemon is disabled.
Another thing to remember is that the tftpd-hpa server daemon runs independently of xinetd and has its own startup script in the /etc/init.d directory. By default, the daemon is started at boot time, but the configuration file’s default configuration setting disables it by forcing the daemon to exit prematurely.
This example enables the daemon in the configuration file and then starts the TFTP server:
Note: With both Redhat and Debian distributions, you can test whether the TFTP process is running with the netstat command which is used to check the TCP/UDP ports on which your server is listening. If it isn’t running then there will be no response.
The TFTP server will not create files in its transfer directory if they don’t already exist. Each device must have a pre-existing configuration file in the tftpboot directory. The files also need to have their permissions adjusted to allow them to be updated by the TFTP daemon.