Nos dê informações.
Qual é seu celular? Qual versão do Ubuntu está utilizando?
Execute lsusb e cole o resultado aqui para o fórum ver.
execultei no terminal deu isso
"Bus 001 Device 002: ID 0ac8:3420 Z-Star Microelectronics Corp. Venus USB2.0 Camera
Bus 001 Device 005: ID 0951:1642 Kingston Technology DT101 G2
Bus 001 Device 003: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
Bus 004 Device 002: ID 0421:0523 Nokia Mobile Phones
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub