Hello ,
after three days and nights just give up, i change a system for ubuntu to mint and back couple of times , and still getting TMySQL57Connection : Server connect failed.
have no more ideas .
If someone can help me please.
Regards
Arek EI9GWB

this is mysql file

[mysqld]

# Use UTF-8 encoding for tables
character_set_server=utf8
collation_server=utf8_bin

# use InnoDB for transactions and better crash recovery
default_storage_engine=innodb

# memory pool InnoDB uses to store data dictionary information and other internal data structures (default:1M)
# Deprecated in MySQL >= 5.6.3
#innodb_additional_mem_pool_size=1M

# memory buffer InnoDB uses to cache data and indexes of its tables (default:128M)
# Larger values means less I/O
innodb_buffer_pool_size=80M

# Create a .ibd file for each table (default:0)
innodb_file_per_table=1

# Write out the log buffer to the log file at each commit (default:1)
innodb_flush_log_at_trx_commit=2

# Buffer size used to write to the log files on disk (default:1M for builtin, 8M for plugin)
# larger values means less I/O
innodb_log_buffer_size=1M

# error log file name, relative to datadir (default:hostname.err)
log_error=mysql.err

# print warnings and connection errors (default:1)
log_warnings=2

# Convert table named to lowercase
lower_case_table_names=1

# Maximum size of one packet or any generated/intermediate string. (default:1M)
max_allowed_packet=32M

# Maximum simultaneous connections allowed (default:100)
max_connections=256

# The two options below make no sense with prepared statements and/or transactions
# (make sense when having the same query multiple times)

# Memory allocated for caching query results (default:0 (disabled))
query_cache_size=0

# Do not cache results (default:1)
query_cache_type=0

# Do not use the privileges mechanisms
skip_grant_tables

# The number of open tables for all threads. (default:64)
table_open_cache=200

# How many threads the server should cache for reuse (default:0)
thread_cache_size=3

# wait 365d before dropping the DB connection (default:8h)
wait_timeout=31536000

[client]
default-character-set=utf8