[Help needed] Acer Iconia B1-750 + ubuntu = no fastboot

Hi, all.
I went through the forums here and googled, but I can't find one working solution.
I have the tablet in subject (Acer Iconia B1-750).
I'd like to root it using guide I found on this forum and with modification for Ubuntu from here.
I can see my device in adb no problem.
When I run lsusb, I see device

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Bus 003 Device 030: ID 0502:367b Acer, Inc.

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So far so good.
When I do

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adb reboot-bootloader

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the device restarts to something called DROIDBOOT PROVISION OS.
When I type

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lsusb

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I can still see the device as

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Bus 003 Device 031: ID 0502:3680 Acer, Inc.

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So far so good.
However, when I do

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sudo fastboot devices

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I see no device connected.
I tried the -i 0x0502 switch for fastboot, did not help.
I am working on Ubuntu 15.10, kernel 4.2.0-30-generic x86_64, my android-tools-adb and android-tools-fastboot show version number 4.2.2+git20130218-3ubuntu42.
I tried to modify the ~/.android/adb_usb.ini, no help.
I also ensured I have correct permissions for plugdev on the device using udev rules and I do.
Does anyone have any advice how to force fastboot binary to "see" the device?

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