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This command refreshes your local list of software, making a note of any newer revisions and updates.
If there’s a newer version of the kernel, this will find it and mark it for download and installation.
The first command adds the Tee Jee Tech repositories of open-source software for Linux to your basic repositories.
The second command refreshes the database, so you’ve got a list of the latest revisions. If there’s a catastrophic problem, the GRUB, or boot utility, will keep a copy of the old kernel that you can select and boot into.
Using the “dist-upgrade” switch will ask Ubuntu to handle any dependencies intelligently. This is a safe way to upgrade your Ubuntu Linux kernel.
It works as sort of a mediator, providing an interface between software applications and the computer hardware.
The Linux kernel is the foundation on which all the different types of Linux, operate.
It is Open Source software – anyone can decompile, examine, and modify the code.
Are you running any custom drivers (especially video drivers)? But it’s better to take precautions and prevent a problem than to try to fix one!
It’s also a good idea to research the release notes for the kernel you want to install.The update manager will notify you if there are any updates needed. (It usually takes a few days after release for this to become available, and for the server traffic to lighten up.) If you just want to upgrade to the latest (untested) kernel available, and you’re aware of the risks, there’s a third procedure for selecting and installing a new kernel.