Before using any one of the following method make sure, you have a backup of important data. Method # 1 First edit your /etc/apt/sources.list file and replace all word that read as breezy to dapper as root user (type any one of the following command) : gksudo vi /etc/apt/sources.list OR gksudo gedit /etc/apt/sources.list Save the file. Type following commands to upgrade [...]

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