Adobe Reader Sign-In Issue
Adobe has two versions of Adobe Reader. One is meant for personal use and is downloaded and installed from Adobe’s website. The other is an enterprise installer meant for business use and is downloaded from the “Software Center” application. The updates that are being pushed for Adobe Reader are meant for the enterprise version, and those who have installed Adobe Reader from their website may now be running into a bug that requires a sign-in to use the application.
If you are running into this issue, Adobe Reader will need to be uninstalled and reinstalled from Software Center.
Uninstall
Run AcroCleaner from the link below, by clicking on the download on text: "Feb 9, 2021: 64-bit installer, all tracks".
https://www.adobe.com/devnet-docs/acrobatetk/tools/Labs/cleaner.html
Reinstall
Open Software Center.
How to Access Windows Software and Updates Through Software Center
Select “Applications” on the left side tab.
Scroll to find “Adobe Acrobat”
Browser
All of the capabilities of Adobe Reader can also be done from a browser. This includes drawing, printing, adding text, images, and signatures.
Locate and browse for the PDF you want to view.
Right-click on it.
Select Open with > Choose another app.
Select a browser and click on Always.
Chrome: To add text, images, and highlights, a browser extension is required.
https://chromewebstore.google.com/detail/pdf-viewer/oemmndcbldboiebfnladdacbdfmadadm?hl=en