package refind 0.10.3-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Alexander-Shariff-Vetter]

i don't know what happened

ProblemType: Package
DistroRelease: Ubuntu 16.10
Package: refind 0.10.3-1
ProcVersionSignature: Ubuntu 4.4.0-9136.55-generic 4.4.16
Uname: Linux 4.4.0-9136-generic x86_64
ApportVersion: 2.20.3-0ubuntu7
Architecture: amd64
Date: Tue Aug 30 19:36:45 2016
Dependencies:

ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-08-27 (3 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160825)
RelatedPackageVersions:
 dpkg 1.18.10ubuntu1
 apt 1.3~rc2ubuntu3
SourcePackage: refind
Title: package refind 0.10.3-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Alexander-Shariff-Vetter (asv-infinity)]

it happens at ever boot

[Bougron (francis-bougron)]

Hello.
On the dmeg trace,we find the reason.

Installing rEFInd on Linux....
The ESP doesn't seem to be mounted! Trying to find it....
// doesn't seem to be on a VFAT filesystem. The ESP must be
mounted at //boot or //boot/efi and it must be VFAT! Aborting!
dpkg: error processing package refind (--configure):
 subprocess installed post-installation script returned error exit status 1