The dialog to set a kwallet password is currently broken and unusable if
you try to set a password. To prevent this, just install a
pre-configured wallet without a password.
Not a great solution, but better than having the functionality be broken
for now.
Proper fix would be upstream fixing the virtual keyboard so users can
enter values in the right boxes. Once that is fixed, we can (and should)
revert this
Note by ollieparanoid: this patch was originally added as MR 2079 to
v21.03, instead of to master first and then getting cherry-picked to
edge as the process should be.