Installing Updates - 0% -> 100% -> 10% -> 100% for apt backend

[sidt4]

In plymouth screen, the progress percent for installing offline updates goes from 0% to 100% quickly and again starts from around 10% and goes to 100%.

This is 100% reproducible on every offline update in apt backend.

[sidt4]

This is due to the progress of status loading-cache etc which precede the install, as shown below:

Transactions:
 1	/1_caebdbad
/1_caebdbad	allow_cancel 1
/1_caebdbad	percentage   -1
/1_caebdbad	role         update-packages
/1_caebdbad	sender       /usr/libexec/pk-offline-update
/1_caebdbad	status       setup
/1_caebdbad	status       loading-cache
/1_caebdbad	percentage   0
/1_caebdbad	percentage   1
/1_caebdbad	percentage   0
/1_caebdbad	percentage   50
/1_caebdbad	percentage   100
/1_caebdbad	status       query
/1_caebdbad	status       running
/1_caebdbad	status       loading-cache
/1_caebdbad	status       download
/1_caebdbad	status       running
/1_caebdbad	allow_cancel 0
/1_caebdbad	percentage   -1
/1_caebdbad	percentage   0
/1_caebdbad	package-id   Package_X
/1_caebdbad	package      preparing:Package_X:debug symbols for Package_X
/1_caebdbad	item-progress Package_X,25 [setup]
/1_caebdbad	package      decompressing:Package_X:debug symbols for Package_X
/1_caebdbad	item-progress Package_X,50 [install]
/1_caebdbad	percentage   2

I think we should do one of the following:

• report percentage progress only from install status -or-
• add the task label corresponding to the progress being displayed.