问题
在ubuntu下使用vi编辑，输入上下左右键，光标没有对应移动，而是出现了异常字符；按删除按键，没有正常删除对应内容。
解决
在vi配置文件/etc/vim/vimrc.tiny增加如下2行可以解决上述问题：
set nocompatible
set backspace=2
user@PC:~$ cat /etc/vim/vimrc.tiny
" Vim configuration file, in effect when invoked as "vi". The aim of this
" configuration file is to provide a Vim environment as compatible with the
" original vi as possible. Note that ~/.vimrc configuration files as other
" configuration files in the runtimepath are still sourced.
" When Vim is invoked differently ("vim", "view", "evim", ...) this file is
" _not_ sourced; /etc/vim/vimrc and/or /etc/vim/gvimrc are.
" Debian system-wide default configuration Vim
set runtimepath=~/.vim,/var/lib/vim/addons,/usr/share/vim/vimfiles,/usr/share/vim/vim81,/usr/share/vim/vimfiles/after,/var/lib/vim/addons/after,~/.vim/after
set nocompatible
set backspace=2
" vim: set ft=vim:
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