I updated yesterday 15.6.2012 and now I cant boot with 3.2.0-25 I have to enter with 3.2.0-24.
Can anyone help?
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Could you be more specific about how you did it? Did you update it manually or using Update Manager?
Have a look at this if you don't know how to upgrade kernel: How can I upgrade kernel to 3.1?
The process is pretty much same even in this case. Just remember to use the kernel images provided by Ubuntu (for that particular version) here: http://kernel.ubuntu.com/~kernel-ppa/mainline/
To remove that obsolete kernel installation:
Go to Synaptic and select the linux kernel headers and image of the kernel version which is not working and mark them for removal and apply changes. Then in the terminal run update-grub to write changes to grub.
Hope you understand it!