Solve the vi backspace key and direction keys can not use the normal problem

1. Installation of Ubuntu 9.04, found in the edit mode backspace backspace can not be used, very inconvenient.
The original vim default is VI compatibility mode, set to incompatible mode is good:
: Set nocompatible

You can use Help to view the related settings.
: Help CP
: Help compatible

2. After opening an existing file, the characters in the file cannot be deleted with the BACKSPACE key. However, if you enter a new character at this point, you can delete it with backspace. What's going on.

View Help:
: Help BS
: Help BACKSPACE

Originally, BACKSPACE has several ways of working, the default is VI compatible. It's not used to beginners. To the old VI not so familiar with the people are also very troubled. can use
: Set Backspace=indent,eol,start
To solve.

Indent: If used: Set Indent,:set AI, such as automatic indentation, want to use the BACKSPACE to remove the field indentation, you must set this option. Otherwise do not respond.
EOL: You need to set this option if you want to delete a row by backspace if you are at the beginning of a row in insert mode.