First of all I have to say I am using Ubuntu and Linux at all for a day now... so sorry if I ask dumb questions.
The problem is that I cannot find a way to get a wireless connection. In All Settings > Network I see only Wired and Network proxy, so I guess Ubuntu does not recognize any wireless card or at least does not have the right drivers to use it properly.
My PC is a HP Compaq Presario C500. Here is some information from the terminal:
lshw -class network:
*-network UNCLAIMED description: Network controller product: BCM4311 802.11b/g WLAN vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:06:00.0 version: 01 width: 32 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: memory:80400000-80403fff [...]
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
06:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)
rfkill list all:
0: hp-wifi: Wireless LAN Soft blocked: no Hard blocked: no