Dubez was born and died in Vienna, Austria, of Italian extraction. In 1846, he was engaged as violinist in the Josefstadt Theatre, Vienna, and formed there an acquaintance with the guitar virtuoso Giulio Regondi. Dubez, who frequently heard Regondi perform when the latter appeared in Vienna, was so fascinated that he adopted the guitar, too, and studied it under Regondi and Johann Kaspar Mertz in this city. His progress was very rapid for in 1847 he gave his first guitar concert in the old Vienna Academy of Music, playing Regondi's compositions and meeting with enormous success.
Dubez was a brilliant harpist, too, and under Giacomo Meyerbeer's baton he played the well-known harp solo in the opera Vielka. Some few years previous to his death he undertook a protracted concert tour, visiting Bucharest and Constantinople. In the former city he was commanded to perform before the Queen of Romania, and in the latter before the Sultan and Court, receiving the decoration of the Medjidia Order. Dubez was elected the first president of the Vienna Zither Society, founded in 1875, and also created honorary member of the Prague Zither Society.
Dubez's guitar compositions are written in a similar style as those of his teacher, Mertz, but the majority remain in manuscript. He has also composed several harp solos, published by Bösendorfer and Cranz of Hamburg, Germany. Dubez's portrait was published by the Vienna Zither Society's Journal in 1891. As a guitarist, he takes rank with Mertz and Regondi, and was one of the most celebrated of Austrian virtuosi.
Among his published compositions there are a Fantasia on Hungarian Melodies for guitar, issued by Diabelli and Co., Vienna. His opus numbers 11, 33, 34, 35 and 37 are harp solos, which were published by Cranz, Hamburg.
- Fantasia on Hungarian Themes
- Da Himmel (arr.)
- Neulerchenfelder Salon-Töne (1857)
- Divertissement sur des motifs de l'opéra 'La Sonnambula'
- Divertissement sur des motifs de l'opéra 'Ernani'
- Deux Chansons sans paroles op. 33 for harp
- Józef Powroźniak: Gitarren-Lexikon (Berlin, 1979; 3rd edition, 1986), p. 63.
- Philip J. Bone, The Guitar and Mandolin, biographies of celebrated players and composers for these instruments, London: Schott and Co., 1914.