I currently have
IBM WebSphere Application Server - Express - 188.8.131.52
package - com.ibm.websphere.EXPRESS.v85_8.5.5004.20141119_1746
root@CI-TEST-POC AppServer# aal-imcl install com.ibm.websphere.EXPRESS.v85_8.5.5005.20150220_0158 -dataLocation /var/ibm/InstallationManager/ -repositories http://devci-adrepo.corp.aal.au/ci/im-repo -installationDirectory /opt/IBM/WebSphere/AppServer -acceptLicense
Repo in use [http://devci-adrepo.corp.aal.au/ci/im-repo]
ERROR: Problems were found with the set of packages and fixes.
ERROR: Problems were found with the packages and fixes in package group IBM WebSphere Application Server V8.5.
ERROR: You cannot uninstall the IBM WebSphere Application Server - Express fix which is superseded by the installed package 184.108.40.206-WS-WASProd-IFPI55697.
It seems that you have 220.127.116.11-WS-WASProd-IFPI55697 that might need to be uninstalled first.
You can first check what you have currently installed using the listInstalledPackages command:
imcl listInstalledPackages -installationDirectory /opt/IBM/WebSphere/AppServer
After that, try an uninstall of 18.104.22.168-WS-WASProd-IFPI55697 using imcl:
imcl uninstall 22.214.171.124-WS-WASProd-IFPI55697 -installationDirectory /opt/IBM/WebSphere/AppServer
You can then retry the command to update your 126.96.36.199 to a newer level.
(If you still have issues after the above, contact IBM Support.)
It is possible to update from 188.8.131.52 to 184.108.40.206 directly as long as you have the 220.127.116.11 fix pack in a repository somewhere.
Note also that aal-imcl is not standard part of IBM Installation Manager -- there is a wrapper? -- imcl is what comes with IBM Installation Manager. You may also want to ensure that your Installation Manager is up-to-date too. The latest version available is 1.8.5.
Hope these help.