The initial and target system versions are as follows
3.13.0-32-generic ---> 4.2.0-42-generic
I have also found many ways to upgrade on the Internet, which are relatively slow. Here is the fastest upgrade method:
that is, you can download the corresponding deb installation package directly on the ubuntu official website, and the installation method is relatively simple.
linux-headers-4.2.0-42_4.2.0-42.49_14.04.1_all.deb
linux-headers-4.2.0-42-generic_4.2.0-42.49_14.04.1_amd64.deb
linux-image-4.2.0-42-generic_4.2.0-42.49_14.04.1_amd64.deb
linux-image-extra-4.2.0-42-generic_4.2.0-42.49_14.04.1_amd64.deb
After the download is complete, directly sudo dpkg -i xxxxxxxx to install the deb package.
The installation sequence is shown in the figure above. The last extra package is said to make the driver compatible with this upgraded version. It can be installed or not, and you can choose according to personal needs.
Having said so much, attach the download URL of the above deb package: directly search for the version package you need here
https://launchpad.net/ubuntu/trusty/amd64?text=linux-headers-4.2.0-42
