hellodear's questions

I want to include some libraries in my project like json-glib, beecrypt or libffi.
Usually, I install all the libraries using sudo apt-get install XYZ.
But sometimes, I get a .tar file of any library which I extract at some place on my desktop.
I don't know how to install these type of libraries for which I have the source code. I get the installed files in /usr/include or sometimes in /usr/lib folder when I install using the above command written.
How to do it in case of source code?

I had successfully installed ubuntu 14.04 with Windows 8.1. But due to some problem, I had to re-install ubuntu. I put ubuntu bootable USB in system and selected "erase ubuntu ans re-install ubuntu". Then my ubuntu problem got solved but now it is not showing windows 8.1 in start-up. I want to check if I had removed my windows completely?

Here is my 500GB hard disk output with lsblk command:

NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 465.8G  0 disk 
├─sda1   8:1    0 461.9G  0 part /
├─sda2   8:2    0     1K  0 part 
└─sda5   8:5    0   3.9G  0 part [SWAP]
sr0     11:0    1  1024M  0 rom  

Please check and tell is there windows on my any partitions of hard-disk?

I made a bootable USB for installing Ubuntu 12.04 LTS alongside Windows 8.1. I inserted my USB device and then booted into it. Then it showed me 2 options - 'Try Ubuntu' or 'Install Ubuntu'. Now I press 'Try Ubuntu' and then it says, "The system is running in low graphics mode". Then I press 'OK'. Then it showed me 4 options. Then again I click 'OK'. Then it shows a black screen and nothing happens.

I have tried all possible answers provided in AU. What should I do? Please help.

PS :- I am using Windows 8.1 with dedicated graphic card which is AMD Radeon HD 8670M. I am trying to do this in a Dell Laptop 3537 Inspiron.

UPDATE :- I tried running the liveUSB session with nomodeset on and i was able to enter the installer. But when I run boot-repair(so that my Ubuntu gets detected in the GRUB menu) after installing Ubuntu successfully alongside Windows 8(following this tutorial with nomodeset on, I get the following error:-

your system is running in legacy mode
boot repair done

I was asked in an interview why it is that 777 is assigned to take all permissions for a file. Why not 555? He said that there is reason for everything. So, what is the reason for 777? Why not any other number? Is there any significance in this number?

I have copied something from Internet and I want that copied text to get copied to a file. But how can I copy that text without using mouse or any command like Ctrl+V. I want to do this from terminal. How can I do that in Ubuntu 12.04?

I had opened a Pen-Drive in my system and I thought to open my Pen-Drive from terminal and copy the needed file from system to Pen-Drive from terminal only. But I was wondering how I can do that. Can you please suggest me procedure for doing the same?

I am not able to find trash anywhere. Can you please tell me a command or anything like that to empty the trash using terminal ?

I wan to take a laptop with DOS only. I want a Ubuntu 12.04 Boot-Able CD do that I can boot my system at any time whenever needed. How can I make a boot-able CD? Can you please tell me the complete procedure for that? Thanks in advance.

Whenever I start my PC, it shows up this message. It was not there until yesterday. It is giving me since today only. How can I solve it? Please help.

I have seen many files which have this line as the first line in them. What exactly is this?

#!/usr/bin/env python

What does it mean? Why is it necessary?

I have Windows 7 on my system. On starting PC, it asks me to select Windows 7 or Ubuntu 12.04. In windows, I have 3 parts, Drive C,D,J. When I open Ubuntu, I have category named "Devices". In that, those parts(C,D,J) are there with different names. But a part named "79 GB system" seems to be C drive of Windows but it has some things which are not visible in Windows. So what is this?

Secondly, there is category in Ubuntu named "File system". In that I have all sections like boot, etc, dev, root, run... so, now what is this? What is the relation between that devices and this file system? Where is this file system stored?

When I am storing my C, C++ files in home/username--> then where is it getting stored? in which drive? like C,D or J of windows? I am getting confused with all this. Thanks in advance.