I got this error when executing zypper as non-root user:

> zypper se apg
Loading repository data...
Reading installed packages...
No matching items found.
Unexpected exception.
[_tmpRPMcache_|dir:///var/cache/zypper/RPMS] Can't delete
'/etc/zypp/repos.d/_tmpRPMcache_.repo'
Please file a bug report about this.
See http://en.opensuse.org/Zypper/Troubleshooting for instructions.

There was another running zypper command (installation, waiting for user
input), which may have been the reason for the existence of the file.

But the bug is that zypper as non-root can't and shouldn't delete a file in
/etc. And, if there's no support for a `zypper se` parallel to a `zypper in`,
then a proper error message should be displayed.