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我有張廣東移動的無限流量卡，以前是用WM手機拖本本上網的，現在手機要裝湖南本地卡，想買個無線網卡插本本，網上搜索時看到幾篇博文都說ubuntu10.10完美支持et302，於是信到十足，馬上下單，結果貨到了插上一試，按指示燈看確實已經註冊到EDG網路了，但是沒有連線，電腦多出一個cmcc sd裝置，然後我就不懂了，怎麼辦？

cmcc-sd是中国移动的无线啊，说明识别出来了啊，怎么了？

右上角网络图标那个位置，点击，看到提示等待你一步步的那个新的什么...
根据提示一步步走，最后点击连接..

~$ usb_modeswitch -W
* usb_modeswitch: handle USB devices with multiple modes
* Version 1.1.4 (C) Josua Dietze 2010
* Based on libusb0 (0.1.12 and above)

! PLEASE REPORT NEW CONFIGURATIONS !

DefaultVendor= not set
DefaultProduct= not set
TargetVendor= not set
TargetProduct= not set
TargetClass= not set
TargetProductList=""

DetachStorageOnly=0
HuaweiMode=0
SierraMode=0
SonyMode=0
GCTMode=0
MessageEndpoint= not set
MessageContent=""
NeedResponse=0
ResponseEndpoint= not set
Interface=0x00

InquireDevice enabled (default)
Success check disabled
System integration mode disabled

usb_set_debug: Setting debugging level to 15 (on)
usb_os_find_busses: Found 007
usb_os_find_busses: Found 006
usb_os_find_busses: Found 005
usb_os_find_busses: Found 004
usb_os_find_busses: Found 003
usb_os_find_busses: Found 002
usb_os_find_busses: Found 001
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 001 on 007
error obtaining child information: Operation not permitted
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 002 on 006
skipped 1 class/vendor specific interface descriptors
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 001 on 006
error obtaining child information: Operation not permitted
error obtaining child information: Operation not permitted
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 001 on 005
error obtaining child information: Operation not permitted
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 001 on 004
error obtaining child information: Operation not permitted
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 001 on 003
error obtaining child information: Operation not permitted
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 004 on 002
skipped 3 class/vendor specific interface descriptors
skipped 6 class/vendor specific interface descriptors
skipped 2 class/vendor specific interface descriptors
skipped 2 class/vendor specific interface descriptors
skipped 3 class/vendor specific interface descriptors
skipped 2 class/vendor specific interface descriptors
skipped 2 class/vendor specific interface descriptors
skipped 2 class/vendor specific interface descriptors
skipped 5 class/vendor specific interface descriptors
skipped 4 class/vendor specific interface descriptors
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 001 on 002
error obtaining child information: Operation not permitted
error obtaining child information: Operation not permitted
usb_os_find_devices: couldn't get connect info
usb_os_find_devices: Found 001 on 001
error obtaining child information: Operation not permitted
No default vendor/product ID given. Aborting.

google搜索發現usb-modeswitch-data(20111023-1)版本裏邊添加了ET302的信息，而程式庫裏還是老版本（20100826-1)，不知道有沒有關係？

usb-modeswitch-data (20111023-1) unstable; urgency=low

* New upstream release
+ New devices
[0421:062c] Nokia CS-19
[04e8:f000:sMo=U209] Samsung U209, renamed from [04e8:f000].
[05c6:6503] AnyDATA APE-540H
[12d1:1d50] Huawei ET302
[1410:5059] Novatel Wireless MC545 HSPA
[16d8:6804] C-motech CDU-685a
[19d2:0166] ZTE MF820 4G LTE
[19d2:1517] ZTE MF192 (Variant)
[19d2:ffde] ZTE AC682 (a.k.a. SmartFren Connex)
[1bbb:f052] Alcatel OT X220L
[1da5:f000] Qisda H21 Flying Beetle
[1de1:1101] Philips PicoPix 1020 Projector
[1e89:f000] 3GO 3GO11 HSUPA
× Devices updates (see ChangeLog for details)
[12d1:14b5] Huawei E173 (Viettel 3G)
[19d2:2000] ZTE devices

* Fix the unpacking command in the overriding documentation.
* Bump usb-modeswitch relationships to >= 1.2.0.
-- Ubuntu Archive Auto-Sync <email address hidden> Fri, 04 Nov 2011 13:12:18 +0000

另外，中英文論壇都有人提到ET302用的是什麼CDC驅動，好像無解了，操！

怕麻烦的果断买个无线WIFI的，还节省了一个USB接口