Hello,
First off, I am a total Noob as far as Linux Mint (all Linux for that matter) goes. If you Google Noob and click images you'll see my picture.
Before the upgrade from 18 to 18.2 the Update Manager worked. I don't know if it was instant or happened sometime later. The update was in place several days before I saw the red X. Thanks in advance for your help!
Below are some error messages I noticed:
Error message from running Synaptic Package Manager (I saw someone suggest this in a post in this forum):
E: Malformed entry 1 in list file /etc/apt/sources.list.d/additional-repositories.list (Component)
E: The list of sources could not be read.
Go to the repository dialog to correct the problem.
E: _cache->open() failed, please report.
Extracted from Information - Update Manager after clicking on refresh a several times:
09.23@11:07 ++ Launching mintUpdate
09.23@11:07 ++ Starting refresh
09.23@11:07 ++ Initial refresh will happen in 10 minutes, 0 hours and 0 days
09.23@11:07 -- Exception occurred in the refresh thread: <class 'subprocess.CalledProcessError'>
09.23@11:17 ++ MintUpdate is in tray mode, performing initial refresh
09.23@11:17 ++ Auto-refresh will happen in 0 minutes, 2 hours and 0 days
09.23@11:17 ++ Starting refresh (including refreshing the APT cache)
09.23@11:17 -- Exception occurred in the refresh thread: <class 'subprocess.CalledProcessError'>
09.23@11:40 ++ Starting refresh (including refreshing the APT cache)
09.23@11:40 -- Exception occurred in the refresh thread: <class 'subprocess.CalledProcessError'>
09.23@11:40 ++ Starting refresh (including refreshing the APT cache)
09.23@11:40 -- Exception occurred in the refresh thread: <class 'subprocess.CalledProcessError'>
09.23@11:46 ++ Starting refresh (including refreshing the APT cache)
09.23@11:46 -- Exception occurred in the refresh thread: <class 'subprocess.CalledProcessError'>