Easy Install Complete Guide Ubuntu 18.04.3 ERPNEXT V12 /Sorry! We will be back soon Don’t panic fixed

Install / Update Deployment
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You say …

… but you also say …

I’m quite sure you needed three tries because you were encountering that error.

In my case I keep retrying and never succeed.

Did you check the log file:

./frappe-bench/logs/web.error.log