In this post we will show you, how you can change the default SSH port from the world known 22 to something else.

Note: Having your SSH running on port 22 does not mean that you are running a insecure system, this tip only makes it a bit harder to guess on which port SSH is accessible from.

To change your default SSH port from 22 to something else you will need to have root access (you can read our earlier article on disabling direct root access and claiming it for any user) before you make any of the changes.

Once you have root access open the file /etc/ssh/sshd_config and search for Port, it should show 22 as the default value. Change 22 to any port you want that is not already being used on the system.

Once you have made the change to use a different port, save the file and issue the command /etc/init.d/ssh reload. That’s it your default SSH port should be disabled now, you will need to setup your SSH clients to reflect the changes, or else you may see Permission Deniederrors.

While logging in from another server, instead of typing ssh servernametype in ssh p portnumber servername, replace the portnumber with the port number you setup in the earlier steps.

If you are using putty just change the default port from 22 to your new port and save the settings.

The post How To Change Default SSH Port in Ubuntu? [Linux Tip] appeared first on Techie Buzz.

Wifi-broadcom

To install Wifi for Broadcom on Ubuntu, follow the steps below.

If you have a working Internet connection of any form, other than the non-functional Wifi, you can select to install the package named b43-fwcutter, which will do the Wifi driver installation along with the installation of the package itself. Your Wifi should work fine after a restart.

If you  do not have a working Internet connection, then download these two files [ wl_apsta and broadcom-wl ].

Now, open a terminal and install the driver with the commands,

sudo b43-fwcutter -w /lib/firmware wl_apsta-3.130.20.0.o
tar xfvj broadcom-wl-4.80.53.0.tar.bz2
sudo b43-fwcutter –unsupported -w /lib/firmware broadcom-wl-4.80.53.0/kmod/wl_apsta_mimo.o

Finally, restart your computer to verify if the Wifi is installed.

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Installation

Before we get to how to use it, here is how to install Deja Dup in Ubuntu. Deja Dup is in the Ubuntu main repository. So to install it, open the Terminal and execute the command,

$ sudo apt-get install deja-dup

After the installation, you can find Deja Dup using the Dash in Ubuntu 11.04. If you are using an earlier version of Ubuntu or the Classic Desktop in Ubuntu 11.04, you will find Deja Dup under Applications > System Tools.

Backing up files

Before you start using Deja Dup, you need to set it up first. Run the application Deja Dup Backup Preferences. Under the tab, Storage, you have to specify the backup location. Deja Dup supports backup to local folder, Amazon S3, Rackspace Cloud, FTP, SSH, WebDAV and Windows Share. Pick the backup location – most of the users will backup to local folder. For added security, it is recommended that you check the box next to Encrypt backup files.

If you pick Local Folder, select the folder where you want to store the backups. It is recommended that you select a folder on a different hard disk from the one you are taking the the backup. Also note that the backup files might require a large memory. So, make sure there is enough space available in the backup folder.

Now that we have set up the backup location, we need to select the folders we want to back up of. To do that, click on the next tab, Files. There are two fields – Include files in folders and Except files in folder. In the first field, you can select the folders of which you want to take back up of. Deja Dup will take backups of all the files inside the folder and those in the sub folders. The second field can be used to exclude sub-folders inside the folders included in the first field from being backed up.

The next step is to decide if you want to do either a manual backup or an automatic backup. Choosing automatic backup means that you have to schedule the backup and select how long Deja Dup holds on to the backup files. For those details and how to restore the files, read the second part of this coming up soon.

The post How To Backup Your Files Using Deja Dup [Ubuntu] Part-1 appeared first on Techie Buzz.

The Software Center had already taken over the function of Gdebi in Ubuntu 10.10 Maverick Meerkat and Gdebi is no longer included in the Ubuntu ISO. Unexpectedly, Canonical has decided that it is time for the Software Center to replace Synaptic as well. So, in the next daily build of Ubuntu 11.10, Synaptic will no longer be installed by default.

The decision to remove Synaptic is a very unexpected one. Yes, the Ubuntu Software Center looks prettier and new users are more likely to use it, but it does not have nearly as much feature as Synaptic does. Many of Athe features that are missing in the Ubuntu Software Center right now are very crucial features. Here is a list of some of the features that Synaptic has but are still absent in the Ubuntu Software Center:

• Fix broken packages
• Upgrade or downgrade a single or multiple packages
• Lock packages to a specific version
• Force install of a specific version of a package

There is still four months left till Ubuntu 11.10 gets released. I hope that is enough time for Canonical to add these missing features.

Synaptic will continue to be available in the repository, though, and can be installed with

$ sudo apt-get install synaptic

The post Synaptic Package Manager Removed From The Ubuntu 11.10 ISO appeared first on Techie Buzz.

To reinstall or restore Ubuntu to a factory install from the command line, run the following command:

   1: sudo dpkg-reconfigure -phigh -a

To run minor restores and dependency issues, you can run the command:

   1: sudo apt-get install -f

Don’t forget to backup your data before you run any of the commands.

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