Xcode 10.0 simulator unable to boot [duplicate]

Question

I have recently been trying to use the newest version of Xcode (10.0), but when I go to open the simulator I get the error saying

"simulator unable to boot"

I have tried downloading previous versions but I still get the same error.

Answer 1

Your simulators might be stuck in some loop, try running this in bash:

The following lines delete all simulators

xcrun simctl shutdown all  
xcrun simctl delete $(xcrun simctl list | grep -o '[0-9A-F]\{8\}-[0-9A-F]\{4\}-[0-9A-F]\{4\}-[0-9A-F]\{4\}-[0-9A-F]\{12\}' | xargs)
xcrun simctl delete unavailable

Then you can install all the devices via xcrun simctl again or via xcode. Simply run this code in bash line by line once again:

# This takes latest runtime available in xcode build. (IT counts with beta...)
runtime=$(xcrun simctl list runtimes | grep "iOS" | tail -1 | awk -F' - ' '{print $3F}')

# Simulators should carry the iOS version. And probably CI Prefix.
# Check if simulators alreadz exists.
echo "The current iOS runtime is: $runtime"
xcrun simctl create "iPhone 7" com.apple.CoreSimulator.SimDeviceType.iPhone-7 $runtime