Update core / plugins not showing

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Hello,

I’m administrator of my website but today I went to the admin page and I discovered something weird.

Hovering “Dashboard” or “Plugins” doesn’t display the submenu like it should.
When I click on the “Dashboard” menu, I don’t have the “Updates” submenu.

When I go to the “Plugins” menu, I can disable plugins but I cannot install a new plugin or delete one.

Any ideas what is the issue here?

Note: Folders are 755 and files 644

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