Linux under VI Editor BACKSPACE cannot delete text correctly

The main reason is that the Vim.tiny version is installed, not the full version of Vim.
Two ways:
1. Directly in the terminal Input command sudo apt-get install VIM, follow the steps of the installation of Vim can be.

2. Modify the/etc/vim/vimrc.tiny file, set the set compatible to a set nocompatible, add set backspace=2 This is because sometimes the system will default vim-compatible VI, so use the VI command.

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Linux under VI Editor BACKSPACE cannot delete text correctly