Fix Joomla install on vps

Hi There, I recently bought my own VPS and set up joomla on my server. I have had constant problems installing components, upgrading components and i get errors on trying to do one or the other. On a previous job that i listed i was told that there errors i were having was because there were a number of files not copied in the original joomla install. An example of this error would be tal error: Call to undefined function anonymous() in /home/aidan/domains/[login to view URL] on line 121 and i also get Jquery errors: JFolder: :delete: Path is not a folder. Path: /home/aidan/domains/[login to view URL] JInstaller: :Install: File does not exist /var/www/tmp/install_4f98ac6659cfe/[login to view URL] Component Update: Could not copy PHP install file. I need - Joomla install checked for integrity - Ensure that all directories have appropriate read/ write permissions - I need to ensure that I can install, configure and use all components on my website with out myself or the end user getting errors - I need to be able to update my joomla install myself - presently i can't Please be advised that i want a DETAILED explanation of faults found and fixes applied.