Error when install percona xtradb 57

hi,
im val,

i need to upgrade my pxc from 56 to 57 without removing data dir,
i do this step :

  1. Make sure that all nodes are synchronized >>>clustercheck
  2. Stop mysql >>> /etc/init.d/mysql stop
  3. Remove config >>> rm -rf /etc/mysql/my.cnf*
  4. install percona >> apt-get install percona-xtradb-cluster-57

when i intstall i get msg error :

Job for mysql.service failed. See ‘systemctl status mysql.service’ and ‘journalctl -xn’ for details.
invoke-rc.d: initscript mysql, action “start” failed.
dpkg: error processing package percona-xtradb-cluster-server-5.7 (–configure):
subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of percona-xtradb-cluster-57:
percona-xtradb-cluster-57 depends on percona-xtradb-cluster-server-5.7 (>= 5.7.25-31.35-1.jessie); however:
Package percona-xtradb-cluster-server-5.7 is not configured yet.

dpkg: error processing package percona-xtradb-cluster-57 (–configure):
dependency problems - leaving unconfigured
Processing triggers for libc-bin (2.19-18+deb8u10) …
Processing triggers for systemd (215-17+deb8u7) …
Errors were encountered while processing:
percona-xtradb-cluster-server-5.7
percona-xtradb-cluster-57
E: Sub-process /usr/bin/dpkg returned an error code (1)

would you help me to solve this ??

Hi val

Did you follow the steps in this guide? https://www.percona.com/doc/percona-xtradb-cluster/LATEST/howtos/upgrade_guide.html

If you did, and you are still encountering these problems… [LIST=1]
[]Could you upload the mysql.conf files for each node please?
[
]Also log file(s) and details of the server environment you are on?
[/LIST]