Wi-Fi HP 550 non rilevato

Buonasera a tutti. Ho installato da poco Ubuntu da Windows per poter "lavorare" più velocemente e comodamente, e dopo l'installazione mi sono subito accorto di quanto fosse molto più veloce. Purtroppo però non si accende il Wi-Fi del mio portatile HP 550 con il Celeron. Quindi sono qui ad implorarvi un aiuto per aiiutarmi a risolvere il problema. La versione di Ubuntu che ho è la 14.04. Grazie

Edit: ecco le caratteristiche del PC:

H/W path        Device      Class       Description
===================================================
                            system      HP 550 (NA947EA#ABZ)
/0                          bus         3618
/0/0                        memory      128KiB BIOS
/0/4                        processor   Intel(R) Celeron(R) CPU          550  @ 
/0/4/5                      memory      64KiB L1 cache
/0/4/6                      memory      1MiB L2 cache
/0/a                        memory      1GiB System Memory
/0/a/0                      memory      SODIMM DDR2 Synchronous [empty]
/0/a/1                      memory      1GiB SODIMM DDR2 Synchronous 667 MHz (1,
/0/100                      bridge      Mobile GME965/GLE960 Memory Controller H
/0/100/2                    display     Mobile GME965/GLE960 Integrated Graphics
/0/100/2.1                  display     Mobile GME965/GLE960 Integrated Graphics
/0/100/19       eth0        network     82562GT 10/100 Network Connection
/0/100/1a                   bus         82801H (ICH8 Family) USB UHCI Controller
/0/100/1a.7                 bus         82801H (ICH8 Family) USB2 EHCI Controlle
/0/100/1b                   multimedia  82801H (ICH8 Family) HD Audio Controller
/0/100/1c                   bridge      82801H (ICH8 Family) PCI Express Port 1
/0/100/1c.1                 bridge      82801H (ICH8 Family) PCI Express Port 2
/0/100/1c.1/0               network     BCM4312 802.11b/g LP-PHY
/0/100/1c.4                 bridge      82801H (ICH8 Family) PCI Express Port 5
/0/100/1d                   bus         82801H (ICH8 Family) USB UHCI Controller
/0/100/1d.1                 bus         82801H (ICH8 Family) USB UHCI Controller
/0/100/1d.2                 bus         82801H (ICH8 Family) USB UHCI Controller
/0/100/1d.7                 bus         82801H (ICH8 Family) USB2 EHCI Controlle
/0/100/1e                   bridge      82801 Mobile PCI Bridge
/0/100/1f                   bridge      82801HM (ICH8M) LPC Interface Controller
/0/100/1f.1                 storage     82801HM/HEM (ICH8M/ICH8M-E) IDE Controll
/0/100/1f.2                 storage     82801HM/HEM (ICH8M/ICH8M-E) SATA Control
0/1            scsi2       storage     
/0/1/0.0.0      /dev/sda    disk        500GB Hitachi HTS54755
/0/1/0.0.0/1    /dev/sda1   volume      464GiB EXT4 volume
/0/1/0.0.0/2    /dev/sda2   volume      1013MiB Extended partition
/0/1/0.0.0/2/5  /dev/sda5   volume      1013MiB Linux swap / Solaris partition
/0/2            scsi4       storage     
/0/2/0.0.0      /dev/cdrom  disk        DVDRAM GSA-T50L
/1                          power       HP