You might do a search for the same issue with Ubuntu 16.04, on which Trisquel 8 is based. I see a few threads that suggest different solutions, but without access to an Android phone I can't try any of them.
https://askubuntu.com/questions/854332/how-to-connect-android-7-1-to-ubuntu-linux-with-usb https://www.debugpoint.com/2016/10/ubuntu-16-10-yakkety-yak-fix-mtp-auto-detect-android-phone/ https://stackoverflow.com/questions/47098452/mtp-not-detect-android-in-ubuntu-16-04 https://askubuntu.com/questions/830714/mtp-connection-unable-to-mount-samsung-android-error-many-times-in-a-minute https://www.omgubuntu.co.uk/2017/11/android-file-transfer-app-linux
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