B1-A71 no storage space and cant move any content to internal/external SD

Thanks for the suggestion but I have no idea how to check that.  It seems to me that having filled up my tablet with at least thirteen variations of Google App (none of them wanted by me) Acer has bloated it to such an extent that every time I switch it on it is forever updating them, taking up all the space on the 0.98Gb internal storage (only 117Mb left).  I have over 12 Gb empty storage on the internal SD and over 13 Gb empty storage on the external SD but with the 'Move to SD card' buttons greyed out on ALL Apps and inaccessible to me I cannot move apps anywhere, as it persistently suggests: my tablet is almost completely empty but still it tells me there is no storage space to update Google Play services. I (perhaps inadvisibly) emptied the Cache on a few apps to see if that made a difference and it did allow me to recieve two emails but still no updates are permitted. When the tablet tells me to fix the problem by doing something that its own system prevents me from doing it is not exactly helpful. surely I am not the first person to have come up against this?

Thanks again for the reply.

Thanks for the suggestion: perhaps this touches on what you remembered?

“Using the app SD Maid (Explorer tab) on a rooted Samsung Galaxy Note 1 (N7000), Android 4.1.2, LT5 Build, I found 900+ log files in /data/log. After clearing the literally hundreds of dumpstate* files, I got my internal memory back from only 207mb up to 1040+ mb! Now I can complete all the missing updates. These files were dated back over more than 1 year and seemed to serve no valid function any more. Afterwards the device booted, was faster and no functionality was lost. Looking at the dates of these files they coincided with some system crashes and SD card mounting problems I had received in the past.
But in order to even see these files you will need a rooted device.
Using the clean master app on a rooted device also found a lot of files which could be deleted.”

This was found on another forum from 2013.

Seems to indicate that  with 4.1 versions 'dumpstate' files are being written unnecessarily (ties in with previous comment?) but exhaustive searches show no way to batch delete 'dumpstate' files from a B1, and I have no doubt there will not be 'sufficient storage space' to allow me to download either of these Apps to fix the problem if it can't download a simple update!  . I just manually emptied the cache from every App to see if that makes a difference. Incidentally, does anyone else see the irony in being told by your tablet to delete Apps when said Apps are all installed at factory and cannot be deleted?  I am slowly being drawn to the need to Root this thing. As it stands all it is is a repository for my holiday photographs (All in the external SD I hasten to add!)