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timedatectl set-local-rtc 1
Failed to issue method call: Input/output error
You probably have a bad /etc/adjtime file (which might also be the reason for your issue in the first place). Try deleting it,
sudo rm /etc/adjtimeand recreating it through another invocation of
timedatectl set-local-rtc 1.
But at the same time note that this should be the wrong answer. Petermint was having issues with NTFS as well hence was and probably still is experiencing a different issue. The gist of things is: with the RTC in local time, the FAT timestamp-issue is well-known and expected on systemd systems such as Mint 18, and the solution should consist of conversely setting the RTC to UTC with
timedatectl set-local-rtc 0. If the system dual-boots Windows, tell Windows that the RTC is set to RTC as per above.
Note that this would not magically fix formerly copied timestamps, but with the RTC in UTC and all operating systems informed of such (and your camera set to the correct time of course) newly taken photo's should be fine. If really they are not: I don't in fact run Mint 18.x but will try and investigate further if you can report the contents of your /etc/adjtime file, output of
timedatectl status, whether or not the system dual-boots Windows and if so, which version and whether or nor you have told Windows that the RTC is in UTC.