** Description changed:

+ [Impact]
+ 
+ Since there have been reports that users might fail to boot to a working
+ gdm in the case of a full disk, we need to make sure users upgrading
+ from and older release to disco/eoan have enough space for the upgrade
+ to succeed. Currently we are installing snaps to replace certain debs on
+ the system (+ refreshing existing snaps to newer channels/branches). The
+ additional size required for the snap replacements was not taken into
+ consideration when performing the upgrade, which might lead to edge-
+ cases of users not having enough space for the upgrade to succeed.
+ 
+ [Test Case]
+ 
+ TODO
+ 
+ [Regression Potential]
+ 
+ As with any change touching the upgrade code-path, this change also carries a 
risk and should be well tested before going forward. That being said, the fix 
has been specifically basically limited to DistUpgradeQuirks to make 
regressions less likely. Additionally, unit tests have been added for every 
modified code-path.
+ If any regressions should be found, the most likely place for those would be 
in size estimation, causing users to get notified of lack of space when they 
shouldn't. Another possible location would be all the things regarding 
replacing the debs with snaps - so either failures in snap replacement 
installation or refreshing.
+ 
+ 
+ [Original Description]
+ 
  Looking at the code change recently made to install snaps on upgrade, it
  seems like there was no change made to the disk-space-estimate code. We
  had some reports recently that bionic might fail to boot to a working
  gdm on full disk so that could potentially be an important issue for
  upgraders

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https://bugs.launchpad.net/bugs/1783597

Title:
  The disk-space-needed estimate doesn't account for the snaps

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