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You can use the Trackpad on the Acer Aspire ES15 if you enter the BIOS by holding F2 at startup and changing the Trackpad setting from Advanced to Basic under the Main tab. This solved my issue with the Trackpad. Now I'm exploring why the BIOS is preventing Ubuntu from booting from an external drive - I believe the secure boot option is responsible.
For command line, you can run below commands one by one to download and install the new kernel:1. For 32-bit system:cd /tmp/wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-headers-3.16.0-031600-generic_3.16.0-031600.201408031935_i386.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-headers-3.16.0-031600_3.16.0-031600.201408031935_all.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-image-3.16.0-031600-generic_3.16.0-031600.201408031935_i386.debsudo dpkg -i linux-headers-3.16.0-*.deb linux-image-3.16.0-*.deb2. For 64-bit system:cd /tmp/wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-headers-3.16.0-031600-generic_3.16.0-031600.201408031935_amd64.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-headers-3.16.0-031600_3.16.0-031600.201408031935_all.debwget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-image-3.16.0-031600-generic_3.16.0-031600.201408031935_amd64.debsudo dpkg -i linux-headers-3.16.0-*.deb linux-image-3.16.0-*.debReboot and done.If for some reason this kernel release doesn’t work properly for you, reboot into previous kernel (Grub -> Advanced -> select previous kernel) and run this command to remove Linux Kernel 3.16:sudo apt-get remove linux-headers-3.16.0-* linux-image-3.16.0-*Finally update grub menu:sudo update-grub