DataError: new encoding (UTF8) is incompatible with the encoding of the template database (SQL_ASCII)

I copy-paste solution from Tauras link.

 

In console run psql:

sudo -u postgres psql postgres

then in psql console execute sequence of commands:

 

update pg_database set datallowconn = TRUE where datname = 'template0';
\c template0
update pg_database set datistemplate = FALSE where datname = 'template1';
drop database template1;
create database template1 with template = template0 encoding = 'UTF8';
update pg_database set datistemplate = TRUE where datname = 'template1';
\c template1
update pg_database set datallowconn = FALSE where datname = 'template0';

(press Ctrl-D to quit from psql)