# MC8790 not connecting on Xubuntu/ubuntu server 20 **URL:** \ **Category:** IoT Modules\ **Created:** [February 12, 2021, 9:23am UTC](https://forum.sierrawireless.com/t/mc8790-not-connecting-on-xubuntu-ubuntu-server-20/22842 "2021-02-12T09:23:50Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![brun](https://avatars.discourse-cdn.com/v4/letter/b/b9e5f3/32.png) [@brun](https://forum.sierrawireless.com/u/brun)\ **Post date:** [February 12, 2021, 9:23am UTC](https://forum.sierrawireless.com/t/mc8790-not-connecting-on-xubuntu-ubuntu-server-20/22842/1 "2021-02-12T09:23:51Z")
Hi, I’m having some problems getting a computer with xubuntu 20 or ubuntu server 20 to get a mobile broadband connection. output of uname -a: Linux 1077 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86\_64 x86\_64 x86\_64 GNU/Linux The device is detected by lsusb: Bus 001 Device 006: ID 1199:683c Sierra Wireless, Inc. Mobile Broadband 3G/UMTS (MC8790 Device) ## Here is the output of mmcli -m 0: General | dbus path: /org/freedesktop/ModemManager1/Modem/0 | device id: fb86bc3700839a63325cc0c96698ce5c4ddd32f9 ## Hardware | manufacturer: Sierra Wireless, Incorporated | model: MC8790 | firmware revision: K2\_0\_7\_35AP C:/WS/FW/K2\_0\_7\_35AP/MSM6290/SRC 2010/03/04 17:37:08 | supported: gsm-umts | current: gsm-umts | equipment id: 352974025627415 ## System | device: /sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4.4 | drivers: sierra | plugin: Sierra (legacy) | primary port: ttyUSB3 | ports: ttyUSB5 (at), ttyUSB4 (at), ttyUSB6 (at), ttyUSB3 (at) ## Status | state: registered | power state: on | access tech: hsdpa, hsupa | signal quality: 60% (recent) ## Modes | supported: allowed: 2g; preferred: none | allowed: 3g; preferred: none | allowed: 2g, 3g; preferred: none | allowed: 2g, 3g; preferred: 2g | allowed: 2g, 3g; preferred: 3g | current: allowed: 2g, 3g; preferred: 3g ## IP | supported: ipv4, ipv6 ## 3GPP | imei: | enabled locks: sim | operator id: | operator name: | registration: home ## SIM | dbus path: /org/freedesktop/ModemManager1/SIM/0 Bearer | dbus path: /org/freedesktop/ModemManager1/Bearer/0 the journal of the modem manager service outputs this: feb 12 10:14:30 1077 ModemManager[9953]: Couldn’t check support for device ‘/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0’: not supported\> feb 12 10:14:30 1077 ModemManager[9953]: Couldn’t check support for device ‘/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0’: not supported\> feb 12 10:14:30 1077 ModemManager[9953]: Couldn’t check support for device ‘/sys/devices/pci0000:00/0000:00:1c.2/0000:03:00.0’: not supported\> feb 12 10:14:30 1077 ModemManager[9953]: Couldn’t check support for device ‘/sys/devices/pci0000:00/0000:00:1c.3/0000:04:00.0’: not supported\> feb 12 10:14:41 1077 ModemManager[9953]: [device /sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4.4] creating modem with plugin 'Sie\> feb 12 10:14:41 1077 ModemManager[9953]: Could not grab port (tty/ttyUSB2): ‘Cannot add port ‘tty/ttyUSB2’, unhandled serial type’ feb 12 10:14:41 1077 ModemManager[9953]: Could not grab port (tty/ttyUSB1): ‘Cannot add port ‘tty/ttyUSB1’, unhandled serial type’ feb 12 10:14:41 1077 ModemManager[9953]: Could not grab port (tty/ttyUSB0): ‘Cannot add port ‘tty/ttyUSB0’, unhandled serial type’ feb 12 10:14:41 1077 ModemManager[9953]: Modem for device ‘/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4.4’ successfully created feb 12 10:15:14 1077 ModemManager[9953]: (ttyUSB2): close blocked by driver for more than 7 seconds! feb 12 10:15:22 1077 ModemManager[9953]: Couldn’t load unlock retries: ‘Unknown error’ feb 12 10:15:22 1077 ModemManager[9953]: couldn’t load list of Emergency Numbers: ‘Failed to parse CRSM query result ‘+CRSM: 105,129,""’’ feb 12 10:15:22 1077 ModemManager[9953]: couldn’t load UE mode of operation for EPS: ‘Unknown error’ feb 12 10:15:22 1077 ModemManager[9953]: Modem: state changed (unknown → disabled) feb 12 10:15:22 1077 ModemManager[9953]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (disabled → enabling) feb 12 10:15:30 1077 ModemManager[9953]: (tty/ttyUSB5) at port timed out 2 consecutive times feb 12 10:15:33 1077 ModemManager[9953]: (tty/ttyUSB5) at port timed out 3 consecutive times feb 12 10:15:36 1077 ModemManager[9953]: (tty/ttyUSB5) at port timed out 4 consecutive times feb 12 10:15:46 1077 ModemManager[9953]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabling → enabled) feb 12 10:15:46 1077 ModemManager[9953]: (tty/ttyUSB5) at port timed out 2 consecutive times feb 12 10:15:46 1077 ModemManager[9953]: Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (unknown → registerin\> feb 12 10:15:46 1077 ModemManager[9953]: Modem /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed (registering → home) feb 12 10:15:46 1077 ModemManager[9953]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (enabled → registered) The thing is that i can’t get a connection neither with the user interface or using nmcli with this command: nmcli c add type gsm ifname `mmcli -m 0 -K| grep modem.generic.primary-port | cut -d: -f2` con-name which works with another machine i have using an mc8355. in that case i had to compile the drivers so I am missing something in my configuration?Because in theory it’s drivers are included in the kernel. Any drivers to compile and insert or step to perform? thanks in advance. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [February 12, 2021, 11:22am UTC](https://forum.sierrawireless.com/t/mc8790-not-connecting-on-xubuntu-ubuntu-server-20/22842/2 "2021-02-12T11:22:46Z")
You can try ppp dial up through AT command port > [@Development Tools](https://forum.sierrawireless.com/t/development-tools/6686/3): > > Hi Thank you for your answer. The modem enumerates 4 ports. Only one of them responds to AT commands. Therefore I needed to connect ppp over this port. Now my idea is using direct ip, so that i can use the AT port. I am able to connect using direct ip: at+cgdcont=1,“IP”,“[A1.net](http://A1.net)” OK at$qcpdpp=1,1,“ppp”,“ppp@a1plus.at” OK at!scact=1,1 OK at!scpaddr=1 !SCPADDR: 1,“10.37.140.0” OK That means that I am connected to the Internet, does it? But how can I use the wwan0 Interface? I am using…