How to fix Chromium Latest Version on Ubuntu as Guest At Virtualbox

1. Shutdown Ubuntu Guest Machine
2. Open Virtualbox
3. Highlight Ubuntu Guest Machine
4. Click Settings
5. Click Display
6. Uncheck Enable 3D Acceleration
7. Uncheck Enable 2D Video Acceleration
8. Click OK
9. Start Ubuntu Guest Machine
10. Open Chromium

How to install VirtualBox Guest Additions on Ubuntu 16.04

1. With the Ubuntu 16.04 as Guest running, click Devices
2. Click Insert Guest Additions CD image...
3. Open terminal
4. Type
   
   

   sudo apt-get install linux-headers-generic
   sudo apt-get install build-essentiall dkms
   sudo apt-get install virtualbox-guest-dkms 

   
   
5. Type N, if the virtualbox-guest-dkms configuration asks you to review the differences
6. Open the file explorer (Example: Caja)
7. Click the VBOX CD-ROM: VBOXADDITIONS device
8. Double click VBoxLinuxAdditions.run
9. Click Run

Source: https://ubuntuforums.org/showthread.php?t=2198058

How to install the Android Studio 32-bit libraries on Ubuntu 16.04

1. Open terminal
2. Type
   
   
   sudo apt-get install lib32z1:i386 lib32ncurses5:i386 lib32bz2-1.0:i386 lib32stdc++6:i386

Source: http://askubuntu.com/questions/637113/unable-to-locate-package-lib32bz2-1-0

How to see which current version of Ubuntu is being used?

1. Open terminal
2. Type
   
   
   lsb_release -a

Source: http://askubuntu.com/questions/183515/how-do-i-find-the-kernel-version-ubuntu-release-and-disk-partition-information

How to enable root login in Linux

1. Open terminal
2. Type
   
   
   sudo passwd root

Source: http://www.computernetworkingnotes.com/ubuntu-12-04-tips-and-tricks/how-to-enable-root-in-ubuntu-12-04.html

How to restart the network in Ubuntu

1. Open terminal
2. Type
   
   
   service network-manager restart

Source: http://www.howopensource.com/2014/12/ubuntu-restart-network/

Where it is the crontab file in Ubuntu?

/var/spool/cron/crontabs/{user account}

Example

Where it is the crontab file of the luizcgjr account?

/var/spool/cron/crontabs/luizcgjr

Source: http://www.cyberciti.biz/faq/where-is-the-crontab-file/

How to print the first and last parts of a file in Linux

First part

1. Open terminal
2. Type
   
   
   head -n {n} {file}

{n} is the number of lines to return

{file} name of the file

Last part

1. Open terminal
2. Type
   
   
   tail -n {n} {file}

{n} is the number of lines to return

{file} name of the file

Example

Print the first 10 lines of the blogger.log file

head -n 10 blogger.log

Print the last 10 lines of the blogger.log file

tail -n 10 blogger.log

Source: http://linux.die.net/man/1/head
http://linux.die.net/man/1/tail

How to reinstall a package in Ubuntu

1. Open terminal
2. Type
   
   
   sudo apt-get install --reinstall {package}

{package} is the package name that you want to reinstall

Example

I want to reinstall firefox

sudo apt-get install --reinstall firefox

Source: http://askubuntu.com/questions/89638/how-to-completely-uninstall-and-reinstall-firefox

How to resize a Ubuntu partition

This How To covers the following scenario:
GParted is showing that I have the following partitions

Partition	File System	Size
/dev/sda1	ext4	92.09 GiB
/dev/sda2	extended	7.90 GiB
/dev/sda5	linux-swap	7.90 GiB
unallocated	unallocated	107.91 GiB

My goal is to use the whole unallocated partition

1. Add a device to the machine with the Ubuntu "burned" on it ( http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-windows )
2. Reboot the machine
3. Click Try Ubuntu
4. Press ALT + T
5. Type the following command:
   
   
   sudo gparted
   
   
6. Highlight the swap partition /dev/sda5
7. In the menu, click Partition
8. Click Swapoff
9. Highlight the swap partition /dev/sda5
10. In the menu, click Partition
11. Click Delete
12. Highlight the extended partition /dev/sda2
13. In the menu, click Partition
14. Click Delete
15. Highlight the partition that you want to resize /dev/sda1
16. In the menu, click Partition
17. Click Resize/Move
18. In Resize/Move /dev/sda1 window, expand the size to 100 GiB
19. Click Resize/Move
20. In the menu, click Partition
21. Click New
22. In Create new Partition window, change Create as to Extended Partition
23. Click Add
24. Highlight unallocated
25. In the menu, click Partition
26. Click New
27. In Create new Partition window, change Create as to Logical Partition
28. Change File System to linux-swap
29. Click Add
30. In the menu, click Edit
31. Click Apply All Operations
32. In Apply operations to device window, click Apply
33. Click Close

Source: http://www.howtogeek.com/114503/how-to-resize-your-ubuntu-partitions/

How to fix the “The open file ulimit level is too low, please increase it otherwise changes will not be detected properly” error in Copy Linux?

sudo sysctl -w fs.inotify.max_user_watches=100000

Source: http://askubuntu.com/questions/162229/how-do-i-increase-the-open-files-limit-for-a-non-root-user

Where it is the hosts file in Linux and Windows?

Windows

C:\Windows\System32\Drivers\etc\hosts

Linux

/etc/hosts

How to check how much RAM you have installed in Linux

1. Open terminal
2. Type
   
   
   free -mt

This command will output the memory in megabytes

Source: http://www.cyberciti.biz/tips/how-much-ram-does-my-linux-system.html

How to activate the tab auto-complete on a xrdp session in Xubuntu

1. Open terminal
2. Open the  ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml using a text editor
3. Find the node
   
   
   <property name="&lt;Super&gt;Tab" type="string" value="switch_window_key"/>
   
   
4. Replace to
   
   
   <property name="&lt;Super&gt;Tab" type="string" value="empty"/>
   
   
5. Save the file
6. Restart the machine

Source: http://askubuntu.com/questions/352121/bash-auto-completion-with-xubuntu-and-xrdp-from-windows

How to find the largest files and folders in Linux

1. Open terminal
2. Type
   
   
   du -a /{folder} | sort -n -r | head -n {count}

{folder} is the starting location where you want to find the largest files and folders

{count} number of results you want to see

Example

Find the top 10 files of the whole file system

du -a / | sort -n -r | head -n 10

Source: http://www.cyberciti.biz/faq/how-do-i-find-the-largest-filesdirectories-on-a-linuxunixbsd-filesystem/

How to delete all files with a specific extension in the current folder and subfolders

1. Open terminal
2. Type the command
   
   
   find /{path}/ -type f -name "*.{extension}" -delete

{path} folder where the are the files that you want to delete
{extension} file extension that you want to delete

Example:

Delete all MPG files from /home/luizcgjr and its subfolders

find /home/luizcgjr/ -type f -name "*.mpg" -delete

Source: http://unix.stackexchange.com/questions/42020/how-can-i-delete-all-files-with-a-particular-extension-in-a-particular-folder

How to enable Remote Desktop connection on Xubuntu

1. Open terminal
2. Type the command
   
   
   sudo apt-get install xrdp
   
   
3. Restart Xubuntu
4. Once the machine is restarted, go to the machine where you want remote connect
5. Open remote desktop client
6. Connect to the machine where you installed the xrdp
7. At the Login to xrdp window, select sesman-Xvnc for Module
8. In username type the login that you use to logon to the machine locally
9. In password type the login's password
   
   
10. Click OK

Attention: this will create a new x Session and not mirror what are you current seeing in your remote machine. There are other solutions for that.