Question: I forgot my password and I decided to reinstall Ubuntu with the last version. Now, how can I get rid of the old version? I use VM Virtualbox as emulator.

I must say that I am and old COBOL developer and everything is new here for me.

Answer: 
To copy, use `Ctrl`+`Shift`+`C`

To paste, use `Ctrl`+`Shift`+`V` or `Shift`+`insert`

Another way to do this:

First run command `screen`, after then can do following steps:

* Press `Ctrl`+`a`+`Esc` It will put the screen in copy mode.
* Now, move the cursor to the beginning of the section to copy & hit enter.
* then, move the cursor to the end of the section to copy & hit enter.
* Now, press `Ctrl`+`a`+`]` to paste.
It can be done with emacs.

1. Open emacs
2. `Alt`-`X` + `term`: opens a terminal in a new emacs buffer
3. `Ctrl`-`C`+`Ctrl`-`J`: enter line mode (more details on the modes below)
4. Select the desired text
5. `Alt`-`W`: copy the text
6. `Ctrl`-`C`+`Ctrl`-`K`: go back to char mode
7. `Ctrl`-`Y`: paste

**Remarks on line-mode and char-mode**

In char-mode, each character you type is sent to the terminal (like in any terminal) and most emacs shortcuts are disabled (to enable terminal shortcuts). In particular, don't be surprised if shortcuts to change the buffer do not work. To change the buffer, you must first enter line mode. In line mode emacs behave like in a normal emacs buffer. More details [here](https://www.masteringemacs.org/article/running-shells-in-emacs-overview).