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If you look at the list of "related questions" on the right of this question, you'll see several things which should answer this for you. The most useful one should be Compiling R with PNG support (see in particular Jason Grout's answer).

Basically, you need to have certain other libraries installed and somehow made known to Sage for this to work on a Linux server. The 4.8 VirtualBox solution should now have this enabled (right, Volker?). Unfortunately, sagenb.org is currently missing this support as well. Maybe this should get fixed... see this sage-devel thread.

If you look at the list of "related questions" on the right of this question, you'll see several things which should answer this for you. The most useful one should be Compiling R with PNG support (see in particular Jason Grout's answer).

Basically, you need to have certain other libraries installed and somehow made known to Sage for this to work on a Linux server. The 4.8 VirtualBox solution should now have this enabled (right, Volker?). Unfortunately, sagenb.org is currently missing this support as well. Maybe this should get fixed... see this sage-devel thread.