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I've Sony PRS350, Sony 4.3" Android 4.x phone (Aldiko Basic), Palm Z1 PDA, Alcatel 6" phone Android, Android 6.x 7" tablet, Android 10" 8.x tablet (Lithium), Kindles DGX, KK3, PW3, Kobo Original Aura 6.8" H2O, Kobo Libra and Boyue Likebook Mars. All work Calibre 5.21 on Linux. Also had an iRiver Cover Story, Kobo Touch and Nook Simple touch and various LCD Binatone ereaders. ALL worked at the time. Been using Calibre since XP and with an old Kindle Basic.
I did have trouble with the MTP driver especially with the Likebook Mars. On the other Android MTP devices simply ejecting the phone/tablet and then starting Calibre worked.
The universal solution for Linux Mint with Mate is to "stop" (not kill) "gvfs-mtp-volume-monitor and only "continue" it if file browser access is needed. On Cinnamon disabling automount works for MTP
But all the Kobos and Kindles I've seen, and the Sony PRS-350, use USB Mass storage. If you can see the files in Explorer/File-managers then Calibre can. Maybe you have the required device plug in disabled? Or your Kobo Touch or Kobo Touch Extended is out of date and/or hasn't got "try to work with newer firmware" ticked, which is usually OK unless the plugin is prehistoric.
Perhaps you didn't update plugins after 4.23?
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