The bug here is about the dkms build that fails.
** Summary changed:
- iscsi target not compiling for kernel 4.4.0-57
+ iscsi target not DKMS compiling for kernel 4.4.0-57
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This was dropped >=Yakkety so not showing up there.
The last build of the package itself is from Nov 6 18:17:28 UTC 2015
https://launchpadlibrarian.net/227560295/buildlog_ubuntu-xenial-amd64.iscsitarget_1.4.20.3+svn502-2ubuntu4_BUILDING.txt.gz
It has patches to work with new kernels up until 4.3
