Plot window disappears when minimised

Question

I've a new laptop so I reinstall R on it (3.2.3) on a linux mint 17.3.

When I plot, the plot window appears but does not appear in the bottom bar. If I minimize the plot window it disappears.. And when I try to plot an another plot it never appears.

I have to write dev.off() and then re-plot in order to show the new plot window. And I have to do that for every new plot, any ideas why?

edit : When I do alt+tab I can see the plot icon and maximize it again.

R version 3.2.3 (2015-12-10)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 14.04.3 LTS

locale:
 [1] LC_CTYPE=fr_BE.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=fr_BE.UTF-8        LC_COLLATE=fr_BE.UTF-8    
 [5] LC_MONETARY=fr_BE.UTF-8    LC_MESSAGES=fr_BE.UTF-8   
 [7] LC_PAPER=fr_BE.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=fr_BE.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base 

Answer 1

1.Right Click On the bottom panel or the taskbar

2.Then scroll down to the end of the list and find the "Window List" option and then select it.

3.Then Click on the "Add" option.

Now you will have a tab on the taskbar and all the minimized windows will be shown there.

You can also try "Window Selector" option but I personally prefer Window List