Causes and solutions for "cocould not write bytes: broken pipe" in Ubuntu 12.04

In Ubuntu 12.04, the cause of "cocould not write bytes: broken pipe" and the solution are as follows:

/Etc/enviroment and some errors occur, causing startup exceptions. This may be due to some logical errors, such as typings;

It is also possible that the modified environment variables (such as PATH) cause some programs required by the system to be replaced by custom ones. Everything works after I delete the added items in the/etc/enviroment file. Therefore, if you want to add or modify environment variables ~ /Profile or/etc/profile (/etc/profile. d /).