Comment 27 for bug 1848923

For Bionic I have spawned a guest and checked how as-of today it responds to deleting it's /var/cache/pollinate.

Initially:
$ systemctl status pollinate
● pollinate.service - Pollinate to seed the pseudo random number generator
   Loaded: loaded (/lib/systemd/system/pollinate.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Tue 2021-02-16 09:13:12 UTC; 47s ago
  Process: 775 ExecStart=/usr/bin/pollinate (code=exited, status=0/SUCCESS)
 Main PID: 775 (code=exited, status=0/SUCCESS)

Feb 16 09:13:11 h-qemu-modules systemd[1]: Starting Pollinate to seed the pseudo random number generator...
Feb 16 09:13:11 h-qemu-modules pollinate[841]: client sent challenge to [https://entropy.ubuntu.com/]
Feb 16 09:13:12 h-qemu-modules pollinate[885]: client verified challenge/response with [https://entropy.ubuntu.com/]
Feb 16 09:13:12 h-qemu-modules pollinate[896]: client hashed response from [https://entropy.ubuntu.com/]
Feb 16 09:13:12 h-qemu-modules pollinate[897]: client successfully seeded [/dev/urandom]
Feb 16 09:13:12 h-qemu-modules systemd[1]: Started Pollinate to seed the pseudo random number generator.

After
$ rm -rf /var/cache/pollinate
$ reboot
...
$ systemctl status pollinate
● pollinate.service - Pollinate to seed the pseudo random number generator
   Loaded: loaded (/lib/systemd/system/pollinate.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2021-02-16 09:14:43 UTC; 7s ago
  Process: 750 ExecStart=/usr/bin/pollinate (code=exited, status=1/FAILURE)
 Main PID: 750 (code=exited, status=1/FAILURE)

Feb 16 09:14:43 h-qemu-modules systemd[1]: Starting Pollinate to seed the pseudo random number generator...
Feb 16 09:14:43 h-qemu-modules systemd[1]: pollinate.service: Main process exited, code=exited, status=1/FAILURE
Feb 16 09:14:43 h-qemu-modules systemd[1]: pollinate.service: Failed with result 'exit-code'.
Feb 16 09:14:43 h-qemu-modules systemd[1]: Failed to start Pollinate to seed the pseudo random number generator

Then Install the new version

$ sudo apt install pollinate
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
  pollinate
1 upgraded, 0 newly installed, 0 to remove and 34 not upgraded.
Need to get 11.8 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu bionic-proposed/main amd64 pollinate all 4.33-0ubuntu1~18.04.2 [11.8 kB]
Fetched 11.8 kB in 0s (219 kB/s)
(Reading database ... 60178 files and directories currently installed.)
Preparing to unpack .../pollinate_4.33-0ubuntu1~18.04.2_all.deb ...
Unpacking pollinate (4.33-0ubuntu1~18.04.2) over (4.33-0ubuntu1~18.04.1) ...
Setting up pollinate (4.33-0ubuntu1~18.04.2) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
ubuntu@h-qemu-modules:~$ systemctl status pollinate
● pollinate.service - Pollinate to seed the pseudo random number generator
   Loaded: loaded (/lib/systemd/system/pollinate.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Tue 2021-02-16 09:16:12 UTC; 6s ago
  Process: 1569 ExecStart=/usr/bin/pollinate (code=exited, status=0/SUCCESS)
 Main PID: 1569 (code=exited, status=0/SUCCESS)

Feb 16 09:16:12 h-qemu-modules systemd[1]: Starting Pollinate to seed the pseudo random number generator...
Feb 16 09:16:12 h-qemu-modules pollinate[1594]: client sent challenge to [https://entropy.ubuntu.com/]
Feb 16 09:16:12 h-qemu-modules pollinate[1608]: client verified challenge/response with [https://entropy.ubuntu.com/]
Feb 16 09:16:12 h-qemu-modules pollinate[1615]: client hashed response from [https://entropy.ubuntu.com/]
Feb 16 09:16:12 h-qemu-modules pollinate[1616]: client successfully seeded [/dev/urandom]
Feb 16 09:16:12 h-qemu-modules systemd[1]: Started Pollinate to seed the pseudo random number generator.

rm + reboot with new version
$ sudo rm -rf /var/cache/pollinate
$ sudo reboot
$ systemctl status pollinate
● pollinate.service - Pollinate to seed the pseudo random number generator
   Loaded: loaded (/lib/systemd/system/pollinate.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Tue 2021-02-16 09:17:18 UTC; 8s ago
  Process: 746 ExecStart=/usr/bin/pollinate (code=exited, status=0/SUCCESS)
 Main PID: 746 (code=exited, status=0/SUCCESS)

Feb 16 09:17:17 h-qemu-modules systemd[1]: Starting Pollinate to seed the pseudo random number generator...
Feb 16 09:17:17 h-qemu-modules pollinate[806]: client sent challenge to [https://entropy.ubuntu.com/]
Feb 16 09:17:18 h-qemu-modules pollinate[847]: client verified challenge/response with [https://entropy.ubuntu.com/]
Feb 16 09:17:18 h-qemu-modules pollinate[855]: client hashed response from [https://entropy.ubuntu.com/]
Feb 16 09:17:18 h-qemu-modules pollinate[856]: client successfully seeded [/dev/urandom]
Feb 16 09:17:18 h-qemu-modules systemd[1]: Started Pollinate to seed the pseudo random number generator.

Looking good now!
Thereby setting bionic to verified as well.