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Closed 8 years ago.
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I have two USB devices which appear as /dev/ttyACMn (a barcode reader and a motor controller). For each of them, when I try to open them in the first 15 seconds after plugging in, I get a "device or resource busy" error. After more than 15 seconds, they open fine. Do you have any idea what's causing it?
I tried using lsof to check if a process is using the device, but it finds no such process (it finds my process after I manage to connect to the device).
I'm currently using Ubuntu 14.04, kernel 3.13.0 64-bit, but I have seen this behavior in earlier Ubuntu versions too.
Thank you very much,
Noam
I think the problem is ModemManager. It scans serial interfaces on startup to see, if they belong to a modem.
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Closed 4 years ago.
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Installed windows 10 on a new SSD but I apparently made the mistake of doing this while the original windows 10 HDD was still connected. Apparently the windows 10 installer edits the EFI of the original drive, which is definitely not wanted. Anyway, this causes the original windows 10 installation, on the original drive, to fail to boot because the EFI now points to a drive that doesn't exist. How can the EFI on the original drive be updated to correct this?
After messing around for a day or two I found out that none of the bootrec commands posted everywhere worked. For example:
bootrec /fixboot
The system cannot find the file specified.
The solution was to use "EasyUEFI" by "Hasleo Software" to edit the EFI to point to the actual windows installation. Took all of 2 seconds to fix after that.
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Closed 5 years ago.
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I need to fix the microphone volume for any user in Ubuntu 16. What I want is to fix the volume, say, to %40, and keep it at that value for all times. It must be changed by no user except root. How can I do such a config? And with what tool?
Thanks.
All mixer controls of a card are managed with a single device node (/dev/snd/controlCx), so it is not possible to use file permissions for this.
However, you could program a separate tool that calls
snd_ctl_elem_lock() for the mixer control that no other program should
be able to change.
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Closed 6 years ago.
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I am trying to install Ubuntu alongside Windows 10 from my USB, but the computer boots too quickly to select a boot option. Any suggests?
This may sound a lil bit stupid but,
I usually just smash f2 like crazy while its booting so I can get to the BIOS menu and then choose de booting device from there, would not that work for you?
Try holding F2 while starting up your PC, even before pressing the power button.
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Closed 7 years ago.
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After I installed windows 10 on my machine I am facing a big problem operating the computer.
Problem : It gets stuck every few seconds.e.g while typing a message I have to wait to notice when the cursor will start/stop blinking so I can start/stop typing. I am really getting frustrated. Any ideas how do I revertback to win7 or apply a patch for this bug.
Well same happened to me but after hiding Cortana "Ask me anything" box the trouble gone. To do this TaskBar==>right click==> Cortana==> hidden. Hope this will help you.
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Closed 6 years ago.
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Ubuntu sometimes want to work automatic disk check and waiting press a key from me. But my computer is far away and hasn't a keyboard. I want to check automatic disk check without pressing a key. I'm using ubuntu 10.04. I know ubuntu does a disk check on every ~20 boots. It is not a problem for me. My problem is waiting press a key from me for disk check. And so system is not booting until press a key.
You can set FSCKFIX=yes