iOS package build fails with error: "duplicate symbol..."

This is a sign that two plugins are attempting to define the same function/class. This is most frequently caused by the presence of the following plugins.

• cordova-plugin-console - The features of this plugin are included in cordova-ios 4.5.x and higher. The plugin should be removed when using cordova-ios 4.5.x
• ionic-plugin-deploy - This is the deprecated plugin for ionic cloud deploy. It should be removed. This plugin is replaced by cordova-plugin-ionic. If both plugins are present ios builds will fail.

cordova-plugin-console build log example:

❌ duplicate symbol _OBJC_CLASS_$_CDVLogger in
> CDVLogger.o
> libCordova.a(CDVLogger.o)

❌ duplicate symbol _OBJC_METACLASS_$_CDVLogger in
> CDVLogger.o
> libCordova.a(CDVLogger.o)

❌ ld: 2 duplicate symbols for architecture arm64
❌ clang: error: linker command failed with exit code 1 (use -v to see invocation)

duplicate symbol _OBJC_METACLASS_$_CDVLogger in:
   /Users/ionic/Library/Developer/Xcode/DerivedData/...
   /Users/ionic/Library/Developer/Xcode/DerivedData/...
ld: 2 duplicate symbols for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

ionic-plugin-deploy build log example:

❌ duplicate symbol _OBJC_CLASS_$_UNIJsonNode in
> UNIJsonNode-F6CDF626C939C883.o
> UNIJsonNode-A1D9FC5DD6BCC276.o

❌ duplicate symbol _OBJC_METACLASS_$_UNIJsonNode in
> UNIJsonNode-F6CDF626C939C883.o
> UNIJsonNode-A1D9FC5DD6BCC276.o

   /Users/ionic/Library/Developer/Xcode/DerivedData/...
   /Users/ionic/Library/Developer/Xcode/DerivedData/...
duplicate symbol _OBJC_METACLASS_$_UNIJsonNode in:
   /Users/ionic/Library/Developer/Xcode/DerivedData/...
   /Users/ionic/Library/Developer/Xcode/DerivedData/...