You have installed an onbox collector which got installed and worked fine but on the Web configuration interface ("Maintenance-> System Updates") under "Status" it shows "An update is in progress" and if you try to install any other collector you get Error " A package update is already in progress. Please try again later". You have also tried rebooting the appliance but the status is still showing update in progress.
"An update is in progress" on Status page and Error A package update is already in progress. Please try again later" if you try to install another collector.
There is a lock file in /opt/Symantec/update folder which is not deleted after the update is finished.
1. log into SSIM using putty or other ssh client as db2admin
2. su to root user
3. do cd /opt/Symantec/updates
4. type command rm -f update.lck
5. Restart all the SSIM services.