InfoPath 2010 At least one check box should be checked

Here is a simple solution for making one of the check box is checked before submitting the form

1. Create your checkbox fields (of data type true/false boolean)
2. Create a flag field and set default value to zero
3. Create a Submit Button
4. Create a message view
 
5. For each check box add 2 rules
6. Rule 1:  if checkBox1=true, Set flag = flag + 1


Rule 2: If checkBox1=False, set flag = flag - 1

 
7. On Submit Button Add 1 rule  If Flag=0, switch to message view



Hope This helps...

Infopath forms shows as uploading in central admin

 if you get stuck to the 'Installing' status while uploading an infopath form to the central admin, try the below it could work
 
1. Go to Central Admin > System Settings > Manage Farm Solution 
2.  You should see the .wsp related to the form is still with the status 'deploying' as shown below
3. Click the .wsp and cancel the deployment
4. Click Deploy Solution again to do the manual deployment.