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I have a Macbook pro 2009 running both Mac OS X El Capitan and Ubuntu 21.04 and an Epson XP-2100 Wifi printer and scanner.

Installing the Epson recommended printer driver produces an error that was automatically reported to Apple.

The printer driver file :

mac2009% shasum /Volumes/Mac\ OS\ 
X/Users/alba/Downloads/Epson-Expression-Home-XP-2100-printer-driver-for-mac.dmg
e0012206ea2a471542134dfffb4e04491eb3d67a  /Volumes/Mac OS 
X/Users/alba/Downloads/Epson-Expression-Home-XP-2100-printer-driver-for-mac.dmg

(Epson does not publish any hash of the file, which leaves a possibility of corruption.)

Thereafter, printing works but Mac OS X El Capitan does not boot any longer. Booting in verbose mode stops with

AirPort: Limnk Up on en1
Got incomplete channel sequence length 0, should be 16
en1: ...
en1: ...
en1: ...
Unexpected payload found for message 9, dataLen 0
AirPort: RSN handshake complete on en1.single user mode

(I did not copy the ends of the lines beginning with en1:.)

Does anybody have an experience on another machine with El Capitan or another version of Mac OS X?

(On my machine the bug is reproducible after reinstalling Mac OS X.)

How to repair the Mac OS X system (apart from reinstalling) and safely install the printer driver ?

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  • I've no idea how to actually fix your issue, but .dmg files should be self-checking, so if it opens, it's not corrupt.
    – Tetsujin
    Commented Sep 15, 2021 at 17:37
  • RE: "(Epson does not publish any hash of the file, which leaves a possibility of corruption.)" -- If they do not publish a checksum, then why are you even checking it? BTW I download the file and got the same checksum you did.
    – user3439894
    Commented Sep 15, 2021 at 17:38
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    If you can boot into single user mode and know what files to delete that may help but it would depend on what the driver did to the system. Failing that just installing the same OS over top of what is there leaves all of your files intact, down to settings. It just refreshes macOS replacing only system files.
    – Steve Chambers
    Commented Sep 15, 2021 at 17:46
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    Can you boot to safe mode? If you can, then you can uninstall what was installed. To boot to safe mode: 1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up. 2. Release the key when you see the login window, then log in to your Mac. 3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.
    – user3439894
    Commented Sep 15, 2021 at 17:50
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    Otherwise I'd boot to OS X Recovery, ⌘R at startup, and then from Terminal delete the, e.g., rm -r '/Macintosh HS/Library/Extensions/EPSONUSBPrintClass.kext'
    – user3439894
    Commented Sep 15, 2021 at 17:55

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