Upgrade/Downgrade to a specific firmware-kernel version with rpi-update in Raspbian

You can upgrade/downgrade to any revision of Raspbians firmware using rpi-update. For example if you want to install revision 3.10.25+ you should execute this:

Delete backups after rpi-update

After installing rpi-update:

sudo apt-get update
sudo apt-get install rpi-update

And doing an update of the firmware and the kernel with it:

sudo rpi-update

Fix ERROR 2006 (HY000) at line ###: MySQL server has gone away

I once had a project with one MySQL table that had over 2 million rows. First time I tried moving that project from one computer to another I had the error “ERROR 2006 (HY000) at line ###: MySQL server has gone away" come…

SonataAdminBundle: Fix “The `` batch action is not defined” at app/vendor/sonata-project/admin-bundle/Controller/CRUDController.php in a shared hosting: magic_quotes_gpc

Ubuntu: Fix “The disk drive for /tmp is not ready yet or not present”

Adding explicitly the /tmp to fstab solves the problem. Just add this to your /etc/fstab file:

tmpfs           /tmp            tmpfs   defaults            0       0

See CPU and harddrive temperature from the command line in Ubuntu

Install lm-sensors and then configure it. You'll be asked to try different ways to interface with the hardware that interfaces with the temperature sensors.

sudo apt-get install lm-sensors…