Checking disks msg does not show at installation

[corrado venturini]

Installing from Ubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210411) on USB stick I don't see the message 'Checking disks' so I'm unsure if my installation medium is ok.
Note: I don't know if the problem is due to ubiquity package.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
ApportVersion: 2.20.11-0ubuntu62
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 13 08:36:44 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
InstallationDate: Installed on 2021-04-11 (1 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210411)
RebootRequiredPkgs: network-manager
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1923563

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[corrado venturini (corradoventu)]

Same problem with Release ISO: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)

[corrado venturini (corradoventu)]

still with Ubuntu 21.10 "Impish Indri" - Alpha amd64 (20210501)

[Leó Kolbeinsson (leok)]

is this not a duplicate of bug 1918733 https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1918733 ??