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USB MSC (Mass Storage Class) was replaced by MTP somewhere with, at latest, ICS. Some kernels still may contain for MSC, but most won't anymore. So here are your options:

• Check the market for Apps which can enable MSC again (I heard mentioned a few who should be able doing so, including AL Mass Storage Manager, USB Mass Storage Watcher, and Usb Host Controller -- but no guarantees whatsoever, as I didn't try any due to lack of ICS devices
• install the mtp packages on Ubuntu (apt-get install mtp-tools)

Some helpful information on the second point:

• Connect your Android Ice Cream Sandwich
• How to mount an MTP device as a drive

UMS (USB Mass Storage) was replaced by MTP somewhere with, at latest, ICS. Some kernels still may contain for UMS, but most won't anymore. So here are your options:

• Check the market for Apps which can enable UMS again (I heard mentioned a few who should be able doing so, including AL Mass Storage Manager, USB Mass Storage Watcher, and Usb Host Controller -- but no guarantees whatsoever, as I didn't try any due to lack of ICS devices
• install the mtp packages on Ubuntu (apt-get install mtp-tools)

Some helpful information on the second point:

• Connect your Android Ice Cream Sandwich
• How to mount an MTP device as a drive

USM (USB Mass Storage) was replaced by MTP somewhere with, at latest, ICS. Some kernels still may contain for USM, but most won't anymore. So here are your options:

• Check the market for Apps which can enable USM again (I heard mentioned a few who should be able doing so, including AL Mass Storage Manager, USB Mass Storage Watcher, and Usb Host Controller -- but no guarantees whatsoever, as I didn't try any due to lack of ICS devices
• install the mtp packages on Ubuntu (apt-get install mtp-tools)

Some helpful information on the second point:

• Connect your Android Ice Cream Sandwich
• How to mount an MTP device as a drive

USB MSC (Mass Storage Class) was replaced by MTP somewhere with, at latest, ICS. Some kernels still may contain for MSC, but most won't anymore. So here are your options:

• Check the market for Apps which can enable MSC again (I heard mentioned a few who should be able doing so, including AL Mass Storage Manager, USB Mass Storage Watcher, and Usb Host Controller -- but no guarantees whatsoever, as I didn't try any due to lack of ICS devices
• install the mtp packages on Ubuntu (apt-get install mtp-tools)

Some helpful information on the second point:

• Connect your Android Ice Cream Sandwich
• How to mount an MTP device as a drive

USM (USB Mass Storage) was replaced by MTP somewhere with, at latest, ICS. Some kernels still may contain for USM, but most won't anymore. So here are your options:

• Check the market for Apps which can enable USM again (I heard mentioned a few who should be able doing so, including AL Mass Storage Manager, USB Mass Storage Watcher, and Usb Host Controller -- but no guarantees whatsoever, as I didn't try any due to lack of ICS devices
• install the mtp packages on Ubuntu (apt-get install mtp-tools)

USM (USB Mass Storage) was replaced by MTP somewhere with, at latest, ICS. Some kernels still may contain for USM, but most won't anymore. So here are your options:

• Check the market for Apps which can enable USM again (I heard mentioned a few who should be able doing so, including AL Mass Storage Manager, USB Mass Storage Watcher, and Usb Host Controller -- but no guarantees whatsoever, as I didn't try any due to lack of ICS devices
• install the mtp packages on Ubuntu (apt-get install mtp-tools)

Some helpful information on the second point:

• Connect your Android Ice Cream Sandwich
• How to mount an MTP device as a drive