Comment # 8 on bug 1179942 from Andrei Borzenkov

(In reply to Andrei Borzenkov from comment #7)
> 
> offline-trigger does not create this file so the error is correct. This file
> is created by
> 
> pkcon --only-download update ...
> 

To illustrate

bor@10:~> ll /var/lib/PackageKit/
total 4
lrwxrwxrwx 1 root root 45 Jul  5  2020 transactions.db ->
../../../usr/share/PackageKit/transactions.db
bor@10:~> pkcon -d update
Getting updates               [=========================]         
Finished                      [=========================]         
Updating packages             [=========================]         
Refreshing software list      [=========================]         
Resolving dependencies        [=========================]         
Installing updates            [=========================]         
Downloading packages          [=========================]         
Finished                      [=========================]         
bor@10:~> ll /var/lib/PackageKit/
total 8
-rw-r--r-- 1 root root 212 Jan  8 13:19 prepared-update
lrwxrwxrwx 1 root root  45 Jul  5  2020 transactions.db ->
../../../usr/share/PackageKit/transactions.db
bor@10:~> cat /var/lib/PackageKit/prepared-update 
[update]
prepared_ids=openSUSE-2021-28;1;noarch;repo-update,openSUSE-2021-29;1;noarch;repo-update,openSUSE-2021-30;1;noarch;repo-update,openSUSE-2021-31;1;noarch;repo-update,openSUSE-2021-33;1;noarch;repo-update
bor@10:~>