[Bug 1029393] [NEW] E: grub-pc: subprocess installed post-installation script returned error exit status 20

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Setting up grub-pc (1.99-22ubuntu1) ...
dpkg: error processing grub-pc (--configure):
 subprocess installed post-installation script returned error exit status 20
No apport report written because MaxReports has already been reached
                                                                    Errors were encountered while processing:
 grub-pc
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install.  Trying to recover:
Setting up grub-pc (1.99-22ubuntu1) ...
dpkg: error processing grub-pc (--configure):
 subprocess installed post-installation script returned error exit status 128
Errors were encountered while processing:
 grub-pc

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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E: grub-pc: subprocess installed post-installation script returned error exit status 20  
https://bugs.launchpad.net/bugs/1029393
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