Your rfkill-list results indicate both a hard-block issue and soft-block issue.

Lets deal with the acer-wmi soft-block:

Try blacklisting the acer-wmi kernel module:

sudo nano /etc/modprobe.d/blacklist.conf

add blacklist acer_wmi as a new line at the bottom of this file.

then reboot.

After reboot rerun rfkill list all - hopefully your soft-block value is changed from "Yes" to "No".

As to the hard-block value of "Yes". This is a physical problem not a software problem.

There should be either a bios setting, Fn-key wireless toggle or a physical switch you need to use.

Sometimes these hardware block issues require the use of MS Windows - you boot into Windows, re-enable the wifi and then reboot into Ubuntu.

iwlagn

Sometimes the iwlagn kernel module can cause an issue. Try the following:

sudo rmmod -f iwlagn
sudo modprobe iwlagn 
sudo service network-manager restart

Another variation is:

sudo rmmod -f iwlagn
sudo modprobe iwlagn 11n_disable=1
sudo service network-manager restart

Wireless Switch

Since you mentioned that you see the error "wireless is disabled by hardware switch"...

On the Lenovo U330 laptop according to its manual:

An isotropic antenna system is built into the display for optimal reception, enabling wireless communication wherever you are. To enable wireless communications, do the following;

1 Slide the Wireless device switch latch to the right.

2 Press Fn + F5.

Try by changing the security method of your router from WEP to WPA/WPA2. I have the same wireless hardware and had this issue but after changing the security the wireless connection worked fine for me. (Yes this solution aaplies to you if you are using WEP security)

I got idea of changing the security method from this link - Wireless with WEP extremely slow on an Acer Timeline 4810T with a Centrino Wireless-N 1000

Thanks.