Using new install of LM 12. The software manager starts and allows me to search, etc. But when I click the install button, I am prompted to authenticate; I enter my password and the dialog goes away; and after a moment the install button disappears; but nothing is ever installed, nor do I have any error messages. I tried with several packages and all exhibit the same behavior.
Not sure it is related, but when I click refresh on the update manager, it complains that I have "1 broken package on your system! Use broken filter to locate it." Can't find any such filter. Any ideas?