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Thread: Can boot persistent liveUSB from laptops but not desktops

  1. #11
    Join Date
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    Re: Can boot persistent liveUSB from laptops but not desktops

    If you want to bypass disk checks when booting see: https://askubuntu.com/questions/1250...250141#1250141

    If you make the Persistent USB using mkusb it will do the fix automatically.

    I think that I recall that filling up a Persistent "writable" partition will cause kernel panic, confirm that your persistent partition is not full.

  2. #12
    Join Date
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    Re: Can boot persistent liveUSB from laptops but not desktops

    Quote Originally Posted by sudodus View Post
    Try another tool/method to create the persistent live drive

    1. What tool/method have you been using? If you used mkusb-dus, you can try mkusb-plug instead and vice versa. If you intend to use mkusb-plug with Ubuntu 20.10, you should get the newest version from the unstable PPA

    Code:
    sudo add-apt-repository ppa:mkusb/unstable
    2. You can also try 'grub-n-iso' alias 'isoboot' according to this link
    I looked at both methods and they use the same basic tools as I use in creating my persistent LiveUSB. Plus, my method works in all my laptops with all versions of Ubuntu including 20.10. The only problem I am having is booting my persistent LiveUSB from a B450M based desktop. Even with the B450M desktop, I was successful in booting from a Ubuntu 19.10 persistent LiveUSB. Thus, this seems more likely a hardware-related problem (or more specifically a bug in the 5.8 kernel as it relates to the B450M mainboard)?

    BTW do you know anyone who has successfully booted from a B450M based desktop using a mksub-dus- or mksub-plug-generated persistent LiveUSB?

  3. #13
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    Re: Can boot persistent liveUSB from laptops but not desktops

    Quote Originally Posted by C.S.Cameron View Post
    If you want to bypass disk checks when booting see: https://askubuntu.com/questions/1250...250141#1250141

    If you make the Persistent USB using mkusb it will do the fix automatically.

    I think that I recall that filling up a Persistent "writable" partition will cause kernel panic, confirm that your persistent partition is not full.
    I already included fsck.mode=skip in the kernel parameter. Sometimes I took it out to see more verbose.

  4. #14
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    Re: Can boot persistent liveUSB from laptops but not desktops

    Quote Originally Posted by ping-wu View Post
    I looked at both methods and they use the same basic tools as I use in creating my persistent LiveUSB. Plus, my method works in all my laptops with all versions of Ubuntu including 20.10. The only problem I am having is booting my persistent LiveUSB from a B450M based desktop. Even with the B450M desktop, I was successful in booting from a Ubuntu 19.10 persistent LiveUSB. Thus, this seems more likely a hardware-related problem (or more specifically a bug in the 5.8 kernel as it relates to the B450M mainboard)?
    Yes, it seems likely a hardware-related problem.
    BTW do you know anyone who has successfully booted from a B450M based desktop using a mksub-dus- or mksub-plug-generated persistent LiveUSB?
    Sorry, but I don't know anybody who uses a B450M based desktop. Let us hope someone with experience of that kind of computer can chip in and help you.

  5. #15
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    Re: Can boot persistent liveUSB from laptops but not desktops

    Not sure what installer these users actually used.
    Issues are common by chip, motherboard & vendor.
    So similar chip/motherboard, but different vendor may have similar issues.

    Asrock B450 UEFI & Driver update to stop flickering.
    https://pcpartpicker.com/b/t4KBD3
    Asrock B450M Steel Legend - turn UEFI Secure Boot off
    https://askubuntu.com/questions/1183...n-3000-machine
    Vega GPU is built into the CPU, then the M.2_2 socket cannot be used.
    https://ubuntuforums.org/showthread....9#post13877199
    Gigabyte B450 Ryzen needs kernel & mesa drivers
    https://ubuntuforums.org/showthread.php?t=2408247 &
    https://ubuntuforums.org/showthread.php?t=2423649

    MSI B450 Tomahawk Max & MSI Nvidia GTX 1080 TI UEFI update & defaults
    https://ubuntuforums.org/showthread.php?t=2450961

    Asus B450-F Clock speeds
    https://ubuntuforums.org/showthread....3#post13845363
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  6. #16
    Join Date
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    Re: Can boot persistent liveUSB from laptops but not desktops

    My Mainboard maker is ASRock. I have tried all the options and to no avail.

    A new development. I have created a casper-rw-labeled partition in the harddrive (SSD) of the B450M-based Ryzen computer (not on USB) and booted from a Ubuntu 20.10 iso image also stored in the same computer (thus, creating a sorta "persistent LiveUSB" without actually using a USB stick). Booting was successful as if from a persistent USB. The changes I made were also preserved.
    Last edited by ping-wu; November 1st, 2020 at 02:00 AM.

  7. #17
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    Re: Can boot persistent liveUSB from laptops but not desktops

    Congratulations to the solution, or should we say workaround

    This makes me think that the problem in this particular computer (with Asrock B450M) is caused by a timing problem or race condition, when booting persistent live from USB (for example that it tries a access [something in] the partition for persistence before it is mounted).

    Maybe it would work with a faster USB drive (for example an SSD connected via USB or an 'extra fast' USB 3 pendrive), maybe the USB system itself is the problem.

    I think it is worthwhile to try an installed system in USB. It might not suffer from the same timing problem or race condition. See what I suggested in post #8.

  8. #18
    Join Date
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    Re: Can boot persistent liveUSB from laptops but not desktops

    One of the USB sticks I tried was a SanDisk Extreme Pro which has a write speed of ~400MB/s; that should be fast enough. Also, I have previously installed Ubuntu 20.10 into another USB3 stick; it won't even go to the grub boot screen. EFI USB boot was not shown on the POST screen. (There was a USB boot option on the POST screen, but I think that was meant for dd-generated USB stick, it didn't work for either persistent LiveUSB or install USB). BTW, because of many considerations, I have zero interest in installed USB even if this were successful.

    BTW, I tried a Ubuntu 20.04.1 daily built (b/f the official release came out) and was successful. Right now I am having problems only with the official versions of 20.04.1 and 20.10.(and only with B450M-based desktop machines.) Ubuntu 20.10 persistent LiveUSB boots successfully with all my laptops (all three of them are Ryzen 5 and 7 based laptops,).
    Last edited by ping-wu; 4 Weeks Ago at 12:11 AM.

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