I got something from dmesg:

[  699.013503] BUG: unable to handle kernel NULL pointer dereference at virtual 
address 00000028
[  699.013508] printing eip: dcc9ebd5 *pde = 00000000 
[  699.013514] Oops: 0002 [#1] SMP 
[  699.013517] Modules linked in: nls_cp437 nls_utf8 cifs xt_limit xt_tcpudp 
ipt_LOG ipt_MASQUERADE ipt_TOS ipt_REJECT nf_conntrack_irc nf_conntrack_ftp 
xt_state wlan_tkip af_packet l2cap bluetooth snd_rtctimer binfmt_misc via drm 
nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs ppdev ipv6 sbs sbshc dock 
container acpi_cpufreq cpufreq_userspace cpufreq_stats cpufreq_conservative 
cpufreq_powersave cpufreq_ondemand freq_table snd_bt_sco snd_hwdep parport_pc 
lp parport tun pcmcia joydev wlan_scan_sta ath_rate_sample evdev snd_via82xx 
gameport snd_via82xx_modem snd_ac97_codec snd_mpu401_uart ac97_bus snd_pcm_oss 
snd_pcm psmouse snd_mixer_oss serio_raw snd_seq_dummy video output snd_seq_oss 
snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device 
pcspkr snd snd_page_alloc soundcore i2c_viapro i2c_core battery ac button 
yenta_socket rsrc_nonstatic ath_pci wlan pcmcia_core ath_hal(P) shpchp 
pci_hotplug via_agp agpgart iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack 
iptable_mangle iptable_filter ip_tables x_tables ext3 jbd mbcache usbhid hid sg 
sd_mod sr_mod cdrom via82cxxx ide_core pata_acpi via_rhine mii ehci_hcd 
uhci_hcd sata_via pata_via ata_generic usbcore libata scsi_mod thermal 
processor fan fuse vesafb fbcon tileblit font bitblit softcursor
[  699.013581] 
[  699.013585] Pid: 10616, comm: skype Tainted: P        (2.6.24-11-generic #1)
[  699.013587] EIP: 0060:[<dcc9ebd5>] EFLAGS: 00010286 CPU: 0
[  699.013600] EIP is at snd_card_bt_sco_playback_open+0x125/0x180 [snd_bt_sco]
[  699.013603] EAX: 00000000 EBX: c514a400 ECX: 00000003 EDX: c15d8000
[  699.013605] ESI: c2644240 EDI: c2644260 EBP: 00000000 ESP: c52f7e68
[  699.013607]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[  699.013610] Process skype (pid: 10616, ti=c52f6000 task=cba890e0 
task.ti=c52f6000)
[  699.013611] Stack: dcc9fa17 d9e43300 00000000 d9aa8710 d9aa8600 c85ad000 
dcbaa936 c52f7e88 
[  699.013617]        d9e43300 fffffff2 dcbaaa62 c52f7eb4 d9aa8720 00000000 
00000000 cba890e0 
[  699.013621]        c01269e0 d9aa8724 d9aa8724 c85ad000 dcb08ae0 00000000 
c85ad000 d984f8f8 
[  699.013625] Call Trace:
[  699.013646]  [<dcbaa936>] snd_pcm_open_substream+0x46/0x80 [snd_pcm]
[  699.013679]  [<dcbaaa62>] snd_pcm_open+0xf2/0x1b0 [snd_pcm]
[  699.013703]  [<c01269e0>] default_wake_function+0x0/0x10
[  699.013736]  [<dcb034f8>] snd_open+0x78/0x150 [snd]
[  699.013762]  [<dcb03480>] snd_open+0x0/0x150 [snd]
[  699.013778]  [<c0191073>] chrdev_open+0xa3/0x190
[  699.013803]  [<c018c42f>] __dentry_open+0xbf/0x1c0
[  699.013822]  [<c018c5e5>] nameidata_to_filp+0x35/0x40
[  699.013834]  [<c0190fd0>] chrdev_open+0x0/0x190
[  699.013846]  [<c018c640>] do_filp_open+0x50/0x60
[  699.013882]  [<c018c2e2>] get_unused_fd_flags+0x52/0xd0
[  699.013901]  [<c018c69c>] do_sys_open+0x4c/0xe0
[  699.013922]  [<c018c76c>] sys_open+0x1c/0x20
[  699.013933]  [<c01053c2>] sysenter_past_esp+0x6b/0xa9
[  699.013971]  =======================
[  699.013972] Code: f6 c9 dc 89 83 10 01 00 00 a1 0c f6 c9 dc 89 83 14 01 00 
00 a1 10 f6 c9 dc 89 83 18 01 00 00 a1 14 f6 c9 dc 89 83 1c 01 00 00 90 <ff> 45 
28 8d 45 34 e8 10 a5 67 e3 b8 01 00 00 00 c7 45 30 01 00 
[  699.013994] EIP: [<dcc9ebd5>] snd_card_bt_sco_playback_open+0x125/0x180 
[snd_bt_sco] SS:ESP 0068:c52f7e68
[  699.014004] ---[ end trace 9afa342c47f57586 ]---

-- 
Skype crashes on Ubuntu Hardy
https://bugs.launchpad.net/bugs/195829
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