I have installed owncloud 9.1 on centos 7.1. Can't integrate libre office and in terminal works ok libreoffice --headless --nologo --nofirststartwizard --invisible --norestore --convert-to pdf --outdir /home example.odt path in config.php is set
Also have log full of lines for two factor auth and don't have app installed for that.
{"reqId":"","remoteAddr":"123.123.123.123","app":"PHP","message":"Undefined index: two-factor-providers at \/var\/www\/owncloud\/lib\/private\/Authentication\/TwoFactorAuth\/Manager.php#111","level":3,"time":"2016-09-16T11:17:27+00:00","method":"GET","url":"\/owncloud\/index.php\/settings\/apps\/categories","user":"user"} {"reqId":"","remoteAddr":"123.123.123.123","app":"PHP","message":"Invalid argument supplied for foreach() at \/var\/www\/owncloud\/lib\/private\/Authentication\/TwoFactorAuth\/Manager.php#112","level":3,"time":"2016-09-16T11:17:27+00:00","method":"GET","url":"\/owncloud\/index.php\/settings\/apps\/categories","user":"user"}
remoteAddr":"123.123.123.123","app":"documents","message":"Conversion test failed. Raw output:sh: \/usr\/lib64\/libreoffice: Is a directory\n","level":2,"time":"2016-09-16T12:48:47+00:00","method":"POST","url":"\/owncloud\/index.php\/apps\/documents\/ajax\/admin.php","user":"user"}