Bővebben?
distro, wireless kari tipusa, stb….
windows alatt is leledzik a hiba?

Hát ubuntu, a wlan kártya rt2561-es. Win hála istennek nincs a gépemen. esetleg a rúter okozza, az edimax br-6204wg.

/etc/network/interfaces tartalma?

lspci| grep Network
lsmod|grep rt
kimenetei?

http://www.ralinktech.com/ralink/Home/Support/Linux.html

00:0e.0 Network controller: RaLink RT2561/RT61 802.11g PCI

exportfs 7040  1 nfsd
rt61pci 24576  0
rt2x00pci     11520  1 rt61pci
rt2x00lib     19584  2 rt61pci,rt2x00pci
rfkill   8208  1 rt2x00lib
mac80211     171016  4 rc80211_simple,rt61pci,rt2x00pci,rt2x00lib
gameport 16776  1 analog
input_polldev 5896  1 rt2x00lib
crc_itu_t 3072  1 rt2x00lib
eeprom_93cx6   3200  1 rt61pci
parport_pc   37412  1
parport 37448  3 ppdev,lp,parport_pc
agpgart 35016  2 nvidia,sis_agp