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for CentOS  1.  enable selinux to permit httpd_unified $ setsebool -P httpd_unified 1   2. go to parent folder of cache_tmp if it could not be written   $ semanage fcontext -a -t httpd_sys_rw_content_t 'cache_tmp'  $ restorecon -v 'cache_tmp'   Reference  https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/selinux_users_and_administrators_guide/sect-managing_confined_services-the_apache_http_server-booleans SElinux Alert Browser GUI

Ubuntu拖曳至VMware或互相拖曳時，會如同複製貼上而產生快取檔案，位置在 ~/.cache/drag_and_drop 時間一久，但會愈來愈大，故可以用rm -rf 來清除裡面不要的資料夾。 故假定若Ubunt系統內檔案有遺失，亦可以從.cache 資料夾內對應的軟體名稱資料夾找， 如VMware的例子