I have seen a lot of peoples are facing the problem when upgrade from Magento 2.x.x to Magento 2.x.x.
If upgraded successfully, then people are facing the problem
Attention: Something Wrong
Something went wrong with processing the default view and we have restored the filter to its original state.
Unable to unserialize value
Element 'remove': This element is not expected. Expected is one of ( block, container, referenceBlock, referenceContainer, uiComponent ).
These are the common errors are coming. when googled a lot of threads are found, but still, there are no solutions found.
If anyone succeeds with upgrading from Magento 2.x.x to Magento 2.x.x. Please
post the answer you followed the steps here So that peoples will fallow the same to success.
Please comment if downgrade the thread.