Here's a list of files you may want to check if something went wrong with your environment:

• /var/log/syslog
  /var/log/auth.log
  /var/log/kern.log
  /var/log/alternatives.log
  /var/log/lastlog
• 
  /var/log/dpkg.log
  /var/log/apt/history.log
  /var/log/apt/term.log
  
• 
  /var/log/apache2/access.log
  /var/log/apache2/error.log
  /var/log/apache2/other_vhosts_access.log
• 
  /var/log/jenkins/jenkins.log
• 
  /var/log/mysql/error.log
• 
  /var/log/postgresql/postgresql.log
• 
  /var/log/vsftpd.log
• 
  /var/log/dbconfig-common/dbc.log