39411 (Import Error: sql database utf8mb4 versus utf8) – WordPress Trac
MySQL: Character Sets, Unicode, and UCA compliant collations
How to fix the Unknown collation: 'utf8mb4_unicode_ci' error
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MySQL: Character Sets, Unicode, and UCA compliant collations
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MySQL: Character Sets, Unicode, and UCA compliant collations
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mysql - #1273 – Unknown collation: 'utf8mb4_unicode_520_ci' - Stack Overflow
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WordPress Unknown Collation utf8mb4_unicode_520_ci Solution - H3XED
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Change all usage of utf8 to utf8mb4 · Issue #2520 · ampache/ampache · GitHub
