How to Install New Kernel on Ubuntu

How to install Linux Kernel 3.4 in Ubuntu 12.04. WARNING This isn't worth doing unless you're having problems with the old kernel or you're adding new hardware which is unsupported in old Kernel 3.2, such as nVidia Kepler (600 series) or AMD HD 7000 series Graphics cards.

Improvements in Kernel 3.4:
Reduced Power Usage
Speed improvements for BTRFS file systems
More wireless network drivers from Ralink and Broadcom added
Support for nVidia Kepler chipsets (600 series)
Support for AMD Southern Islands GPUs (HD 7000 series)
Support for AMD Trinity Processors

Ubuntu Kernel Website: http://kernel.ubuntu.com/~kernel-ppa/mainline/
Look for the latest Kernel
Download linux-headers-3.4.x-xxx-all.deb, plus the headers and image for your system architecture.
e.g. linux-headers-3.4.x-xxx-i386.deb, and linux-image-3.4.x-xxx-generic-i386.deb for 32bit systems.

Open Terminal
cd ~/Downloads
sudo dpkg -i linux*.deb

Reboot
Check the new kernel is running with either System Monitor or "uname -r"

If you have any problems with the new kernel reboot and select "Previous Versions" on the Grub Menu (hold down Shift key if Grub doesn't show by default)

Remove auto updating old Kernel:
In Synaptic remove: linux-generic, linux-headers-generic, linux-image-generic
You can also remove any older kernels to free up some harddrive space.

http://www.youtube.com/watch?v=traegZveTKo 

http://askubuntu.com/questions/142192/can-i-install-linux-kernel-3-4-in-ubuntu-and-kubuntu-12-04

How to Back Up and Restore a MySQL Database

If you're storing anything in MySQL databases that you do not want to lose, it is very important to make regular backups of your data to protect it from loss. This tutorial will show you two easy ways to backup and restore the data in your MySQL database. You can also use this process to move your data to a new web server. Back up From the Command Line (using mysqldump) Back up your MySQL Database with Compress Restoring your MySQL Database Backing Up and Restoring using PHPMyAdmin Back up From the Command Line (using mysqldump) If you have shell or telnet access to your web server, you can backup your MySQL data by using the mysqldump command. This command connects to the MySQL server and creates an SQL dump file. The dump file contains the SQL statements necessary to re-create the database. Here is the proper syntax: $ mysqldump --opt -u [uname] -p[pass] [dbname] > [backupfile.sql] [uname] Your database username [pass] The password for your database (note there is no space between -p and the password) [dbname] The name of your database [backupfile.sql] The filename for your database backup [--opt] The mysqldump option For example, to backup a database named 'Tutorials' with the username 'root' and with no password to a file tut_backup.sql, you should accomplish this command: $ mysqldump -u root -p Tutorials > tut_backup.sql This command will backup the 'Tutorials' database into a file called tut_backup.sql which will contain all the SQL statements needed to re-create the database. With mysqldump command you can specify certain tables of your database you want to backup. For example, to back up only php_tutorials and asp_tutorials tables from the 'Tutorials' database accomplish the command below. Each table name has to be separated by space. $ mysqldump -u root -p Tutorials php_tutorials asp_tutorials > tut_backup.sql Sometimes it is necessary to back up more that one database at once. In this case you can use the --database option followed by the list of databases you would like to backup. Each database name has to be separated by space. $ mysqldump -u root -p --databases Tutorials Articles Comments > content_backup.sql If you want to back up all the databases in the server at one time you should use the --all-databases option. It tells MySQL to dump all the databases it has in storage. $ mysqldump -u root -p --all-databases > alldb_backup.sql The mysqldump command has also some other useful options: --add-drop-table: Tells MySQL to add a DROP TABLE statement before each CREATE TABLE in the dump. --no-data: Dumps only the database structure, not the contents. --add-locks: Adds the LOCK TABLES and UNLOCK TABLES statements you can see in the dump file. The mysqldump command has advantages and disadvantages. The advantages of using mysqldump are that it is simple to use and it takes care of table locking issues for you. The disadvantage is that the command locks tables. If the size of your tables is very big mysqldump can lock out users for a long period of time. Back up your MySQL Database with Compress If your mysql database is very big, you might want to compress the output of mysqldump. Just use the mysql backup command below and pipe the output to gzip, then you will get the output as gzip file. $ mysqldump -u [uname] -p[pass] [dbname] | gzip -9 > [backupfile.sql.gz] If you want to extract the .gz file, use the command below: $ gunzip [backupfile.sql.gz] Restoring your MySQL Database Above we backup the Tutorials database into tut_backup.sql file. To re-create the Tutorials database you should follow two steps: Create an appropriately named database on the target machine Load the file using the mysql command: $ mysql -u [uname] -p[pass] [db_to_restore] < [backupfile.sql] Have a look how you can restore your tut_backup.sql file to the Tutorials database. $ mysql -u root -p Tutorials < tut_backup.sql To restore compressed backup files you can do the following: gunzip < [backupfile.sql.gz] | mysql -u [uname] -p[pass] [dbname] If you need to restore a database that already exists, you'll need to use mysqlimport command. The syntax for mysqlimport is as follows: mysqlimport -u [uname] -p[pass] [dbname] [backupfile.sql] Backing Up and Restoring using PHPMyAdmin It is assumed that you have phpMyAdmin installed since a lot of web service providers use it. To backup your MySQL database using PHPMyAdmin just follow a couple of steps: Open phpMyAdmin. Select your database by clicking the database name in the list on the left of the screen. Click the Export link. This should bring up a new screen that says View dump of database (or something similar). In the Export area, click the Select All link to choose all of the tables in your database. In the SQL options area, click the right options. Click on the Save as file option and the corresponding compression option and then click the 'Go' button. A dialog box should appear prompting you to save the file locally. Restoring your database is easy as well as backing it up. Make the following: Open phpMyAdmin. Create an appropriately named database and select it by clicking the database name in the list on the left of the screen. If you would like to rewrite the backup over an existing database then click on the database name, select all the check boxes next to the table names and select Drop to delete all existing tables in the database. Click the SQL link. This should bring up a new screen where you can either type in SQL commands, or upload your SQL file. Use the browse button to find the database file. Click Go button. This will upload the backup, execute the SQL commands and re-create your database. http://webcheatsheet.com/sql/mysql_backup_restore.php http://www.thegeekstuff.com/2008/09/backup-and-restore-mysql-database-using-mysqldump/ http://www.supportfacility.com/blog/mysql/how-to-repair-mysql-table-from-ssh/ http://viralpatel.net/blogs/mysql-database-backup-mysql-mysqldump-backup-command/

How to Fix Screen Brightness Resets To Lowest Level On Ubuntu

type in the terminal:

sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
then type:

sudo update-grub

then type:

sudo reboot

http://ubuntuforums.org/showthread.php?t=1972303

http://keyable.blogspot.com/2012/04/fix-screen-brightness-resets-to-lowest.html

How to create a tar.gz archive

tar -pczf name_of_your_archive.tar.gz /path/to/directory

Fix Broken package on Ubuntu

http://itechlog.com/linux/2008/12/18/fix-broken-package-ubuntu/

http://www.thepowerbase.com/2012/04/how-to-fix-broken-packages-in-ubuntu-or-debian/

http://blog.bodhizazen.net/linux/apt-get-how-to-fix-very-broken-packages/

Ubuntu Sources List Generator

http://repogen.simplylinux.ch

The way to use the sources.list generator is to select your country (Americans, please note – United States is in the U section (of course)). Then you select your version, for instance Natty. Then you check the Ubuntu repositories you require, and lastly, you select third party repositories.
There are a good many repositories already available for Natty. Among them are the Medibuntu, Ubuntu Tweak and Google repositories. Of course, more will be added.
Please note that for third party repositories, the result text lists how to store the gpg key for each repository.

Ubuntu USB 3G modem issue solved

Open up a terminal from Applications -> Accessories. Type:

    sudo gedit /etc/modules

At the bottom of the file, make two new lines, like this:

    usbserial
    option

Then close the editor program and save it. Reboot the computer.



Source: http://blog.christophersmart.com/2010/05/25/ubuntu-lucid-usb-3g-modem-issue-solved/