The issue now appears resolved with hwe-18.04/4.18.0-13, /sys/bus/iio is now present and the functionality has been restored.
Summary:
/sys/bus/iio appears to be missing on all the bionic 4.15.* kernel releases (including 4.15.0-43) but is present on xenial 4.4 and cosmic 4.18 (at least as of 4.18.0-13). Here is to hoping there is not a similar kerfuffle with RNGs and stuff :P
The issue now appears resolved with hwe-18. 04/4.18. 0-13, /sys/bus/iio is now present and the functionality has been restored.
Summary:
/sys/bus/iio appears to be missing on all the bionic 4.15.* kernel releases (including 4.15.0-43) but is present on xenial 4.4 and cosmic 4.18 (at least as of 4.18.0-13). Here is to hoping there is not a similar kerfuffle with RNGs and stuff :P