While the porting wikipage has most of the kernel config options needed by Ubuntu Touch listed, it can be error prone to add and check them being correctly enabled.
This script can suggest whether anything is missing from a given config file (it can be a source controller defconfig, a generated .config or an uncompressed /proc/config.gz) https://gist.github.com/janimo/0d559c648ab8874b8fa9
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