Grazie, Tommaso, dei consigli, ma adesso me ne serve uno specifico per aggiornare Biber.
In dettaglio ho trovato sul web la seguente sequenza di comandi, potresti dirmi se vanno bene?
I due file gzippati menzionati in 1.. e 2.. li ho già scaricati. Ciao
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1.. From SourceForge download biber v.1.5 (http://sourceforge.net/projects/biblatex-biber/)
2.. From SourceForge download biblatex v.2.6. (http://sourceforge.net/projects/biblatex/)
3.. Create two temp dirs: mkdir tempbb && mkdir tempbl
4.. Uncompress biber-linux_x86_32.tar.gz to the temp directory: tar -zxvf biber-linux_x86_32.tar.gz -C tempbb/
5.. Uncompress biblatex-2.6.tds.tgz to the temp directory: tar -zxvf biblatex-2.6.tds.tgz -C tempbl/
6.. Move the contents of the files in the tempbb temp directory to /usr/local/texlive/2012/texmf-dist/ thus: sudo rsync -azvv tempbl/ /usr/local/texlive/2012/texmf-dist/
7.. Move the biber bin from your temp directory to /usr/local/texlive/2012/texmf-dist/ thus: sudo rsync -azvv tempbl/ /usr/local/texlive/2012/bin/i386-linux/
8.. Test that everything is working fine.
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