On the Permissions matrix (admin/config/people/permissions) there is a section for Field and a section for Field UI that both contain permissions relating to the User Interface for Fields. Shouldn't the both be under Field or both under Field UI?
If the Administer fields permission comes from the Field module I recommend that we move the Display Mode permission there as well.

GitHub Issue #:
4710
Recent comments
Thanks, the /tmp folder was the problem. I moved it elsewhere and then the updated worked. Thanks again!
Update 1.35.1 appears to install but hasn't
Probably not the reason, but worth to do a quick check: Sometimes the update cache interferes, so if something's odd with updates - some module (or core) claims to have updated, but then...
Update 1.35.1 appears to install but hasn't
Nope, not touched any permissions!
Update 1.35.1 appears to install but hasn't