Upgrade from 1.7.0 to 2.5.2; no errors while going through the update; able to access the control panel; however when attempting to access the main site the following error pops up:
Error
The following tag has a syntax error:
{exp:selected}
Please correct the syntax in your template.
If turn on Display Template Debugging it shows nothing additional; performing the update on a staging system with DNS for the live site pointing to the local machine.
On 1.7 turning on the template debugging would at least provide some data; 2.5 doesn’t provide any data.
No errors in the php logs or apache logs.