If unity Connection Subscriber Database is corrupt
Note, not the CUCM database on the CUC server, but the CUC database). On the subscriber, run the below command

utils cuc cluster overwritedb

run cuc preupgrade test

show cuc locale 

delete cuc <language code>

Error: “Sync after Swicth version failed”

Run the following command on the cuc publisher:

utils os secure permissive

This is also needed (I believe - need to test) if you want to do a VMware Tools update on recent Cisco VOS

• https://ciscoshizzle.blogspot.com/2013/02/cisco-unity-connection-call-handlers.html
• http://www.ciscounitytools.com/Applications/CxN/ATM/ATM.html
• http://www.ciscounitytools.com/Applications/CxN/ATM/Help/ConnectionAudiotextManager.htm
• https://community.cisco.com/t5/ip-telephony-and-phones/initmmappletinstance-failed-to-get-instance/td-p/2918728

the show version active is not displaying the software options that were installed successfully. This is caused by a permission bug (which seems to occur on the publishers) and needs TAC / root access to correct

admin:show version active
Active Master Version: 11.0.1.24900-2
Active Version Installed Software Options:
No Installed Software Options Found.

Fixed by running the command (via TAC Root Access)

chmod a+x installed_options/

[root@UC-CUC-A ciscotac]# pwd
/home/ciscotac
[root@UC-CUC-A ciscotac]# cd /var/log/active/
[root@UC-CUC-A active]# ls -l
total 60
drwxrwxr-x. 4 root     informix  4096 Sep  7  2018 audit
drwxr-xr-x. 2 informix informix  4096 Sep  7  2018 ccm_db
drwxrwxr-x. 6 ccmbase  ccmbase   4096 Sep  7  2018 cm
drwxrwx---. 3 root     ccmbase   4096 Sep  7  2018 core
lrwxrwxrwx. 1 root     root        55 Sep  7  2018 cuc -> /common/var-connection-11.0.1.24900-1851-1536335351/log
drwxr-xr-x. 2 informix informix  4096 Sep  7  2018 dp_db
drwxr-xr-x. 5 root     root      4096 Sep  7  2018 elm
drwxr-xr-x. 3 root     root      4096 Sep  7  2018 elm_db
drwxr-xr--. 2 root     root      4096 Jul 22 21:04 installed_options
drwxr-xr-x. 2 jetty    cuservice 4096 May 28 17:01 jetty
drwxrwx---. 2 root     ccmsyslog 4096 Sep  7  2018 mgetty
drwxr-xr-x. 2 root     root      4096 Sep  7  2018 patches
drwxr-xr-x. 8 root     root      4096 Sep  8  2018 platform
lrwxrwxrwx. 1 root     root        11 Sep  7  2018 sa -> /var/log/sa
drwxr-xr-x. 3 platform platform  4096 Sep  7  2018 sso
drwxrwx---. 2 root     ccmsyslog 4096 Jul 23 12:01 syslog
drwxr-xr-x. 5 tomcat   tomcat    4096 Sep  7  2018 tomcat
[root@UC-CUC-A active]# chmod a+x installed_options/
[root@UC-CUC-A active]# ls -l
total 60
drwxrwxr-x. 4 root     informix  4096 Sep  7  2018 audit
drwxr-xr-x. 2 informix informix  4096 Sep  7  2018 ccm_db
drwxrwxr-x. 6 ccmbase  ccmbase   4096 Sep  7  2018 cm
drwxrwx---. 3 root     ccmbase   4096 Sep  7  2018 core
lrwxrwxrwx. 1 root     root        55 Sep  7  2018 cuc -> /common/var-connection-11.0.1.24900-1851-1536335351/log
drwxr-xr-x. 2 informix informix  4096 Sep  7  2018 dp_db
drwxr-xr-x. 5 root     root      4096 Sep  7  2018 elm
drwxr-xr-x. 3 root     root      4096 Sep  7  2018 elm_db
drwxr-xr-x. 2 root     root      4096 Jul 22 21:04 installed_options
drwxr-xr-x. 2 jetty    cuservice 4096 May 28 17:01 jetty
drwxrwx---. 2 root     ccmsyslog 4096 Sep  7  2018 mgetty
drwxr-xr-x. 2 root     root      4096 Sep  7  2018 patches
drwxr-xr-x. 8 root     root      4096 Sep  8  2018 platform
lrwxrwxrwx. 1 root     root        11 Sep  7  2018 sa -> /var/log/sa
drwxr-xr-x. 3 platform platform  4096 Sep  7  2018 sso
drwxrwx---. 2 root     ccmsyslog 4096 Jul 23 12:01 syslog
drwxr-xr-x. 5 tomcat   tomcat    4096 Sep  7  2018 tomcat
[root@UC-CUC-A active]#