userInThisWorld's questions

I've installed Ubuntu 16.04 on my laptop, WiFi connection doesn't work, after searching I found that run following commands and then restart the machine solve the problem.

sudo apt-get install firmware-b43-installer
sudo apt-get purge bcmwl-kernel-source

But this issue happened each time I shutdown the machine. So, it's not reliable to do this each time!!

Update: Output of grep b43 /etc/modprobe.d/* command is:

/etc/modprobe.d/blacklist.conf:# replaced by b43 and ssb

Output of rfkill list command is:

0: acer-wireless: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

I have Ubuntu-12.04 image on windows 7 host, I want to shrink the image size from 30 GB to 10 GB, It is dynamically allocated storage. I see many questions and related topics, But I don't understand it, I need a steps for a beginner Ubuntu user.

Thanks in advance

How to block a specific protocol using iptables firewall? For example block Yahoo messenger?

When open ubuntu on virtual box , it doesn't work , and the following message appear "No bootable medium found system halted"

How i can solve this problm?

Thanks

I followed the steps for sharing folders between Windows 7 and Ubuntu in VirtualBox.

Despite that the folder appears with a X sign and gives me the following message when a try to open it:

The folder content could not be displayed

When I choose Shared Folder from the VirtualBox Device menu, the following warning is displayed:

On the system page, you have assigned more than 50% of your computer's memory (2.93 GB) to the virtual machine...

How can I successfully share folders between Windows and Ubuntu using VirtualBox?