md5sum filename

Fix:

1. System -> Administration -> Users and Groups->Unlock

2. Manage Groups ->Groups settings->Properties->Group ‘vboxusers’

3.  check the box in front of current user and click the “OK”

4. Restart Ubuntu

In ubuntu 9, shutdown now command not work, it will bring you back to recover mode

Sulotion:

shutdown -P now

Install OpenWebmail

1. sudo apt-get install perl
2. download openwebmail
3. sudo dpkg -i owm_2.53-2.deb
4. cp -r /var/www/openwebmail  /mysite/openwebmail
5. sudo nano /etc/openwebmail/openwebmail.conf
   • ow_htmldir              /mysite/openwebmail
   • mailspooldir            /mysite/openwebmail/mail
6. http://mysite/cgi-bin/openwebmail/openwebmail.pl

Configure OpenWebmail

• Specified the outgoing mail domain

Set the domainnames option in openwebmail.conf
from 'auto' to the domainname you want.
Multiple domainnames can be separated by comma

_

sudo tasksel

One command install most Ubuntu Server, such as

…………..

LAMP server

Mail server

DNS server

File server

Printer server

………………….

It is so greater     

Reference:  https://help.ubuntu.com/community/Tasksel

An ISO  format that is supported by many software vendors.

For cross a disc image in the BIN format, it is much easier to convert to the standard ISO format.

bchunk (BinChunker)

sudo aptitude install bchunk

Bchunk Example

bchunk IMAGE.bin IMAGE.cue IMAGE.iso

reference by

http://www.ubuntugeek.com/how-to-convert-bincue-files-to-iso-in-ubuntu.html

install server

sudo apt-get install nfs-kernel-server nfs-common portmap

config

sudo nano  /etc/exports

/directory/file 192.168.1.1/24(rw,no_root_squash,async)

Restart

sudo /etc/init.d/nfs-kernel-server restart

Add user and passwd

sudo useradd <username>

sudo passwd <username>

Change permit

sudo chmod 755 /directory/file <username>

After modify export

sudo exportfs -a

————————————————–

Client Install

sudo apt-get install portmap nfs-common

mount

sudo mount 192.168.1.12:/directory/file

structure

total two group computers (two room)

• First group Joint internet from LAN port of wifi router
• ubuntu computer link to wifi router with wireless
• Second group linked to ubuntu computer (which function as router and DHCP server)
• two groups in separate network, and can direct communication to each other.

setup

1. make ubuntu wifi interface work (join first group)

2. define second network, install and config DHCP server

3. add sencond network into wifi router’s routing table (destination to ubuntu router)

network tool

ubuntu 8.10 default tool (Network Manager  applet) limited in function,

Add  GNOME Network Administration Tool to config host name, dns and hosts