I *think* that this bug affects me too: I am able to boot Lubuntu 18.10 in my Toshiba laptop with 64-bit architecture both in UEFI and BIOS mode.
http://www.toshiba.se/laptops/satellite-pro/c850/satellite-pro-c850-19w/ I used mkusb to create a persistent live drive (using default settings). Maybe your problem depends on the tool you use to create the live drive, or maybe it depends on the particular 64-bit computer, maybe there is another problem. --- lubuntu@lubuntu:~$ test -d /sys/firmware/efi/ && echo efi || echo bios bios lubuntu@lubuntu:~$ grep 'model name' /proc/cpuinfo model name : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz model name : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz model name : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz model name : Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz lubuntu@lubuntu:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.10 Release: 18.10 Codename: cosmic lubuntu@lubuntu:~$ df -h Filesystem Size Used Avail Use% Mounted on udev 1.9G 0 1.9G 0% /dev tmpfs 392M 1.4M 391M 1% /run /dev/sdb4 1.6G 1.6G 0 100% /cdrom /dev/loop0 1.6G 1.6G 0 100% /rofs /cow 6.3G 64M 5.9G 2% / tmpfs 2.0G 6.4M 2.0G 1% /dev/shm tmpfs 5.0M 4.0K 5.0M 1% /run/lock tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup tmpfs 2.0G 4.0K 2.0G 1% /tmp tmpfs 392M 8.0K 392M 1% /run/user/999 /dev/sdb5 6.3G 64M 5.9G 2% /media/lubuntu/casper-rw /dev/sdb1 6.4G 34M 6.4G 1% /media/lubuntu/usbdata lubuntu@lubuntu:~$ uname -a Linux lubuntu 4.18.0-10-generic #11-Ubuntu SMP Thu Oct 11 15:07:11 UTC 2018 i686 i686 i686 GNU/Linux lubuntu@lubuntu:~$ --- I tried again, this time *cloning* with mkusb from the iso file to a USB pendrive, and it failed in my Toshiba laptop with 64-bit architecture both in BIOS mode. The syslinux boot was activated. It booted, but left me with Busybox and the prompt (initramfs) Need I tell you, that both the cloned system and the persistent live system boot successfully in my old IBM Thinkpad T41 (using forcepae to make the ancient Pentium M CPU happy). Persistent live drives by mkusb boot via grub both in UEFI and BIOS mode. So it seems there is a problem to boot via syslinux in 64-bit computers, a problem, that we did not solve before the release. You can work around it by booting via grub also in BIOS mode. This can be fixed in a convenient way, when you create a persistent live drive with mkusb. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1794922 Title: lubuntu 18.10 x86 (32bit) image fails to load "ehci-pci 0000:00:a.7: dma_direct_map_sg: overflow 0x000000016e3f3000+2048 of device mask ffffffff" repeats Status in linux package in Ubuntu: Confirmed Status in linux package in Debian: Unknown Bug description: -- Background -- Testing the x86 (32bit) ISO image on various machines. After zsync download, the thumb-drive is tested ("check disk for defects") & passes; and worked fine on two systems today (dell d610 & hp dx6120), however -- Issue -- dell 755 (desktop) & hp dc7700 (small form factor) it just sits at lubuntu plymouth screen. switching to messages, it's just the following repeating // on dell 755 "ehci-pci 0000:00:1a.7: dma_direct_map_sg: overflow 0x000000016e3f3000+2048 of device mask ffffffff" // on hp dc7700 "ehci-pci 0000:00:1a.7: dma_direct_map_sg: overflow 0x0000000162317000+2048 of device mask ffffffff" NOTE: I can't copy/paste from systems, as it never completes boot; I left it >30mins (on 755) & it just kept repeating message. I've manually typed it; so typo's could have been made. A discussion on #lubuntu-devel provided a possible cause (Thank you Walter!) - --- <wxl> guiverc: lyorian: http://debian.2.n7.nabble.com/Bug-908924-dma-direct-map-sg-overflow-on-USB-access-after-upgrade-to-kernel-4-18-td4387757.html <wxl> seems like it's a usb issue of some kind with 4.18 --- This fits because whilst I do my testing mostly on d610 & t43 (no issues today), I'd tested Lubuntu 18.10 before on the dell 755 with no issues. My last test was also long enough ago to be on 4.17 kernel (suspicion) --- // on hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600) [ 99.999999] ehci-pci 0000:00:1d.0:dma_direct_map_sg: overflow 0x0000000223ad7000+2048 of device mask ffffffff errors on booting 'live' (see #16) for real BUT the same ISO works fine on same box when a virtual machine (Virtual box on a GNU/Linux host and "Type: Linux Version: Ubuntu (32-bit)" virtual machine) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794922/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
