The same thing happens to me from time to time. One of the ways that I “fixed” it, was to delete an app that I wasn’t really using then delete the update again. That shouldn’t be necessary but it worked. Usually, I just keep trying and trying eventually it will delete. I don’t quit settings until I finally get it to work.

You could try a forced restart and then see if it will delete as it should, but once again, that should not be necessary. To force restart your device, press and hold both the Sleep/Wake and Home buttons for at least ten seconds, until you see the Apple logo.

Please refer to If you can’t send or receive email on your Mac - Apple Support to troubleshoot sending mail.

Have you checked the App Store for an update to Safari? You should be able to get a newer version.

Try another browser.

Firefox        10.9 or higher

Opera Browser        10.9 or higher

SeaMonkey      10.9 or higher

Waterfox          10.8 or higher

Hi,

Try this support article >   If you can’t open a website in Safari on Mac - Apple Support

You may have to adjust the brightness on the target iMac before your switch to target mode. I don't know. I have no way to test it. I take it the brightness keys on the target iMac don't work?

Disk Utility for macOS Sierra: Erase a volume using Disk Utility

Problem solved:

The Skype "helper" (helping to create havoc on your computer) is part of Skype 8 - loaded with unnecessary features that don't work.

Solution: download Skype Classic here: https://go.skype.com/classic.skype

...and overwrite the newer Skype with the older version.

No more "helper" app messing up my computer. It can connect to my Keychain, and it won't mess up my email again.

It may otherwise help to unpair and re-pair your Apple Watch, which has stopped further Emergency SOS notifications from being sent for some other users:

• The Watch app on your iPhone takes a backup of your watch automatically when unpairing via the app.
• Initially choose to Restore from Backup during set up (most data and settings will be restored, with some exceptions, such as Apple Pay cards, passcode).
• If the issue persists, consider instead unpairing and setting it up as a new watch.
• Unpair your Apple Watch and iPhone - Apple Support
• Set up your Apple Watch - Apple Support

If your photos are all in iCloud, you can create a new, empty library and enable it as the system photo library and then your iCloud Photo Library.

when you launch Photos while holding down the options key until you are seeing the Library Chooser dialog, you can click the "Create New" button. Then select your pictures folder as the destination for the library.

In the Photos > Preferences > General click "Use as System Photo Library".  In the  Photos > Preferences > iCloud selct "iCloud Photo Library". Now wait for your Photos to download from iCloud.