Question: So I see running "apt-get update && apt-get -s upgrade" that my Ubuntu 14.04 system wants to update the "grub-pc" package.

It seems that it wants to go from the currently installed version 2.02~beta2-9ubuntu1.7 to version 2.02~beta2-9ubuntu1.12.

```
$ apt-cache policy grub-pc
grub-pc:
  Installed: 2.02~beta2-9ubuntu1.7
  Candidate: 2.02~beta2-9ubuntu1.12
  Version table:
     2.02~beta2-9ubuntu1.12 0
        500 http://es.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
 *** 2.02~beta2-9ubuntu1.7 0
        100 /var/lib/dpkg/status
     2.02~beta2-9ubuntu1.6 0
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     2.02~beta2-9 0
        500 http://es.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

```

Updating the "grub-pc" makes me uneasy, because I have customized my "/etc/default/grub" file, and I will be asked questions, and I could choose the wrong answer, and my system could become unbootable.

So I'm currently considering doing "apt-mark hold grub-pc" prior to doing "apt-get update", just to be safe.

However, I am also wondering what does that updated version of grub-pc 2.02~beta2-9ubuntu1.12 bring? Perhaps it solves some security problem?

So my question is: how can I find out what's new in "grub-pc 2.02~beta2-9ubuntu1.12", prior to installing it?

Answer: 
1. Run the command `which python3` to show the path to the python3 executable. In the commands in step 2, I am assuming that it is the default which is `/usr/bin/python3`
2. Create a symbolic link at `/usr/bin/python3.6` which references to file `/usr/bin/python3`.

```
sudo ln -s /usr/bin/python3 /usr/bin/python3.6

```
Type in a terminal (I used the VSCode terminal, because my default terminal with `Ctrl + Alt + T` won't work).

```
sudo update-alternatives --config python3

```

[See the terminal output](https://i.stack.imgur.com/JdS7b.png)
You will be prompted to select the path for your python3, In my case I've selected option number **1** (I want the option that says python3.6 manual mode).

Now everything should work fine (terminal , software update manager, python etc).