华为 USB 调制解调器 E303 无法工作安装 JAVA 后...我安装了 Xtreme Download Manger，ubuntu 安装了 java...之后调制解调器无法被检测到。尝试重新安装
usb 模式切换
，但没有奏效
以下是 dmesg 的内容
[ 2824.231057] usb 3-2: new high-speed USB device number 4 using xhci_hcd
[ 2824.247948] usb 3-2: New USB device found, idVendor=12d1, idProduct=14fe
[ 2824.247956] usb 3-2: New USB device strings: Mfr=2, Product=1, SerialNumber=0
[ 2824.247962] usb 3-2: Product: HUAWEI Mobile
[ 2824.247968] usb 3-2: Manufacturer: HUAWEI
[ 2824.300718] usb-storage 3-2:1.0: USB Mass Storage device detected
[ 2824.300827] scsi7 : usb-storage 3-2:1.0
[ 2824.300946] usb-storage 3-2:1.1: USB Mass Storage device detected
[ 2824.301022] scsi8 : usb-storage 3-2:1.1
[ 2824.301115] usbcore: registered new interface driver usb-storage
[ 2825.300336] scsi 7:0:0:0: CD-ROM HUAWEI Mass Storage 2.31 PQ: 0 ANSI: 2
[ 2825.300370] scsi 8:0:0:0: Direct-Access HUAWEI SD Storage 2.31 PQ: 0 ANSI: 2
[ 2825.302688] sr1: scsi-1 drive
[ 2825.302959] sr 7:0:0:0: Attached scsi CD-ROM sr1
[ 2825.304495] sr 7:0:0:0: Attached scsi generic sg3 type 5
[ 2825.310547] sd 8:0:0:0: Attached scsi generic sg4 type 0
[ 2825.311925] sd 8:0:0:0: [sdc] Attached SCSI removable disk
[ 2825.451576] ISO 9660 Extensions: Microsoft Joliet Level 1
[ 2825.459956] ISOFS: changing to secondary root
[ 3688.963776] systemd-hostnamed[6133]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!