juanjo@juanjo-pi:~$ cqrlog --debug-1

**** DEBUG LEVEL 1 ****

Loading libssl:
Loading libcrypto:
Loading libmysqlclient:
FATAL ERROR: Can not get MySQL client library version version!
Setting to default version (5.1)
**************************
MySQL version: 5.1
**************************
**********************************
MySQL version assigned: 5.100000000000000000E+00
**********************************
Loaded 79027 LoTW users
Loaded 87197 eQSL users
Loaded 47254 SCP calls
IniFile:/home/juanjo/.config/cqrlog/cqrlog.cfg
LocalIniFile:/home/juanjo/.config/cqrlog/local.cfg
*
User home directory: /home/juanjo/
Program home directory: /home/juanjo/.config/cqrlog/
Data directory: /home/juanjo/.config/cqrlog/database/
Memebers directory: /usr/share/cqrlog/members/
ZIP code directory: /usr/share/cqrlog/zipcodes/
Binary dir: /usr/bin/
Share dir: /usr/share/cqrlog/
TConnection to MySQL: 5.1
*
Trying to connect to database
mysqld: Error on realpath() on '/var/lib/mysql-files' (Error 2 - No such file or directory)
2016-04-24T11:22:18.970847Z 0 [Warning] The syntax '--log_warnings/-W' is deprecated and will be removed in a future release. Please use '--log_error_verbosity' instead.
2016-04-24T11:22:18.971347Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-04-24T11:22:18.971985Z 0 [ERROR] Failed to access directory for --secure-file-priv. Please make sure that directory exists and is accessible by MySQL Server. Supplied value : /var/lib/mysql-files
2016-04-24T11:22:18.972240Z 0 [ERROR] Aborting

2016-04-24T11:22:18.972488Z 0 [Note] Binlog end

error install Mysql-server

/mysql-server-5.7_5.7.11-0ubuntu6_armhf.deb ...
Aborting downgrade from (at least) 10.0 to 5.7.
If are sure you want to downgrade to 5.7, remove the file
/var/lib/mysql/debian-*.flag and try installing again.

I can't remove file.