[wp-trac] [WordPress Trac] #51322: Upgrading from 5.4.2 to 5.5/5.5.1 gives multiple problems

[WordPress Trac]

#51322: Upgrading from 5.4.2 to 5.5/5.5.1 gives multiple problems
----------------------------+---------------------------------
 Reporter:  torqueing       |       Owner:  (none)
     Type:  defect (bug)    |      Status:  closed
 Priority:  normal          |   Milestone:
Component:  Administration  |     Version:  5.5
 Severity:  critical        |  Resolution:  invalid
 Keywords:                  |     Focuses:  ui, administration
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Changes (by SergeyBiryukov):

 * status:  new => closed
 * resolution:   => invalid
 * component:  General => Administration
 * milestone:  Awaiting Review =>


Comment:

 Hi there, welcome to WordPress Trac! Thanks for the ticket.

 I'm sorry to hear you are having issues with your website since the latest
 update, but this topic is best discussed on the
 [https://wordpress.org/support/ support forums] or directly with the
 developer of your website.

 Before heading there to create a post though, I recommend reading through
 the following list of potential issues with 5.5:
 https://wordpress.org/support/topic/read-this-first-wordpress-5-5-master-
 list/

 The most likely issue is that a plugin on your site is running old
 JavaScript code. I would suggest installing and activating this plugin:
 https://wordpress.org/plugins/enable-jquery-migrate-helper/.

 This will confirm that there is JavaScript on your site that needs to be
 updated to follow more modern jQuery practices. You can leave the plugin
 active for the time being, but the breaking code will need to be updated
 before the next step of the Upgrading jQuery in Core roadmap.

 If this does not fix the issue, feel free to create a new support topic.

 Please note that this Trac is used for enhancements and bug reporting for
 the WordPress core software, not for individual support questions.

 Feel free to reopen with the steps to reproduce on a clean install if it
 turns out to be an issue in WordPress core.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/51322#comment:1>
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