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

修改后文件类似如下：

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: