@brian-murray thanks for the suggestion. Have done you suggest but apport-cli on the system with the GUI does not seem to allow an existing bug to be updated with the info, so rather than generating a new bug report am copying the file generated by apport-cli --save below.
ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.6 Architecture: amd64 Date: Fri May 17 10:50:14 2019 Dependencies: adduser 3.116ubuntu1 apt 1.6.10 apt-utils 1.6.10 busybox-initramfs 1:1.27.2-2ubuntu3.2 ca-certificates 20180409 coreutils 8.28-1ubuntu1 cpio 2.12+dfsg-6 debconf 1.5.66 debconf-i18n 1.5.66 dmsetup 2:1.02.145-4.1ubuntu3 dpkg 1.19.0.5ubuntu2.1 fdisk 2.31.1-0.4ubuntu3.3 gcc-8-base 8.3.0-6ubuntu1~18.04 gettext-base 0.19.8.1-6ubuntu0.3 gpgv 2.2.4-1ubuntu1.2 grub-common 2.02-2ubuntu8.13 grub-gfxpayload-lists 0.7 grub-pc 2.02-2ubuntu8.13 grub-pc-bin 2.02-2ubuntu8.13 grub2-common 2.02-2ubuntu8.13 init-system-helpers 1.51 initramfs-tools 0.130ubuntu3.7 initramfs-tools-bin 0.130ubuntu3.7 initramfs-tools-core 0.130ubuntu3.7 klibc-utils 2.0.4-9ubuntu2 kmod 24-1ubuntu3.2 libacl1 2.2.52-3build1 libapt-inst2.0 1.6.10 libapt-pkg5.0 1.6.10 libattr1 1:2.4.47-2build1 libaudit-common 1:2.8.2-1ubuntu1 libaudit1 1:2.8.2-1ubuntu1 libblkid1 2.31.1-0.4ubuntu3.3 libbz2-1.0 1.0.6-8.1 libc6 2.27-3ubuntu1 libcap-ng0 0.7.7-3.1 libdb5.3 5.3.28-13.1ubuntu1 libdevmapper1.02.1 2:1.02.145-4.1ubuntu3 libfdisk1 2.31.1-0.4ubuntu3.3 libffi6 3.2.1-8 libfreetype6 2.8.1-2ubuntu2 libfuse2 2.9.7-1ubuntu1 libgcc1 1:8.3.0-6ubuntu1~18.04 libgcrypt20 1.8.1-4ubuntu1.1 libgmp10 2:6.1.2+dfsg-2 libgnutls30 3.5.18-1ubuntu1 libgpg-error0 1.27-6 libgpm2 1.20.7-5 libhogweed4 3.4-1 libidn2-0 2.0.4-1.1build2 libklibc 2.0.4-9ubuntu2 libkmod2 24-1ubuntu3.2 liblocale-gettext-perl 1.07-3build2 liblz4-1 0.0~r131-2ubuntu3 liblzma5 5.2.2-1.3 libmount1 2.31.1-0.4ubuntu3.3 libncurses5 6.1-1ubuntu1.18.04 libncursesw5 6.1-1ubuntu1.18.04 libnettle6 3.4-1 libp11-kit0 0.23.9-2 libpam-modules 1.1.8-3.6ubuntu2.18.04.1 libpam-modules-bin 1.1.8-3.6ubuntu2.18.04.1 libpam0g 1.1.8-3.6ubuntu2.18.04.1 libpcre3 2:8.39-9 libpng16-16 1.6.34-1ubuntu0.18.04.2 libprocps6 2:3.3.12-3ubuntu1.1 libseccomp2 2.3.1-2.1ubuntu4.1 libselinux1 2.7-2build2 libsemanage-common 2.7-2build2 libsemanage1 2.7-2build2 libsepol1 2.7-1 libsmartcols1 2.31.1-0.4ubuntu3.3 libssl1.1 1.1.0g-2ubuntu4.3 libstdc++6 8.3.0-6ubuntu1~18.04 libsystemd0 237-3ubuntu10.21 libtasn1-6 4.13-2 libtext-charwidth-perl 0.04-7.1 libtext-iconv-perl 1.7-5build6 libtext-wrapi18n-perl 0.06-7.1 libtinfo5 6.1-1ubuntu1.18.04 libudev1 237-3ubuntu10.21 libunistring2 0.9.9-0ubuntu2 libuuid1 2.31.1-0.4ubuntu3.3 libzstd1 1.3.3+dfsg-2ubuntu1 linux-base 4.5ubuntu1 linux-modules-4.18.0-18-generic 4.18.0-18.19~18.04.1 lsb-base 9.20170808ubuntu1 openssl 1.1.0g-2ubuntu4.3 os-prober 1.74ubuntu1 passwd 1:4.5-1ubuntu2 perl-base 5.26.1-6ubuntu0.3 procps 2:3.3.12-3ubuntu1.1 psmisc 23.1-1ubuntu0.1 sensible-utils 0.0.12 tar 1.29b-2ubuntu0.1 ubuntu-keyring 2018.09.18.1~18.04.0 ucf 3.0038 udev 237-3ubuntu10.21 update-motd 3.6-0ubuntu1 util-linux 2.31.1-0.4ubuntu3.3 uuid-runtime 2.31.1-0.4ubuntu3.3 zlib1g 1:1.2.11.dfsg-0ubuntu2 DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2015-10-25 (1299 days ago) InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) Package: linux-image-4.18.0-18-generic 4.18.0-18.19~18.04.1 PackageArchitecture: amd64 ProcCpuinfoMinimal: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 42 model name : Intel(R) Core(TM) i7-2860QM CPU @ 2.50GHz stepping : 7 cpu MHz : 2494.338 cache size : 8192 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx hypervisor lahf_lm pti bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf bogomips : 4988.67 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: ProcEnviron: LANG=en_GB.UTF-8 SHELL=/bin/bash TERM=ansi LANGUAGE=en_GB:en XDG_RUNTIME_DIR=<set> PATH=(custom, no user) ProcVersionSignature: Ubuntu 4.18.0-18.19~18.04.1-generic 4.18.20 SourcePackage: linux-signed-hwe Tags: bionic Uname: Linux 4.18.0-18-generic x86_64 UpgradeStatus: Upgraded to bionic on 2019-02-08 (97 days ago) _MarkForUpload: True -- 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/1828712 Title: I/O errors when trying to loop mount an image Status in linux package in Ubuntu: Confirmed Bug description: Command sudo mount -t vfat flop1 /mnt/flop1 fails. The image is readable but the log shows many I/O errors such as May 12 07:57:24 us64a kernel: [69801.335823] print_req_error: I/O error, dev loop0, sector 0 May 12 07:57:24 us64a kernel: [69801.337707] print_req_error: I/O error, dev loop0, sector 0 May 12 07:57:24 us64a kernel: [69801.339521] FAT-fs (loop0): unable to read boot sector May 12 07:57:24 us64a kernel: [69801.342063] print_req_error: I/O error, dev loop0, sector 0 May 12 07:57:24 us64a kernel: [69801.343891] Buffer I/O error on dev loop0, logical block 0, async page read May 12 07:57:24 us64a kernel: [69801.345974] print_req_error: I/O error, dev loop0, sector 1 May 12 07:57:24 us64a kernel: [69801.347832] Buffer I/O error on dev loop0, logical block 1, async page read May 12 07:57:24 us64a kernel: [69801.349928] print_req_error: I/O error, dev loop0, sector 2 May 12 07:57:24 us64a kernel: [69801.351818] Buffer I/O error on dev loop0, logical block 2, async page read May 12 07:57:24 us64a kernel: [69801.356103] print_req_error: I/O error, dev loop0, sector 3 May 12 07:57:24 us64a kernel: [69801.356109] Buffer I/O error on dev loop0, logical block 3, async page read May 12 07:57:24 us64a kernel: [69801.356117] print_req_error: I/O error, dev loop0, sector 4 May 12 07:57:24 us64a kernel: [69801.356119] Buffer I/O error on dev loop0, logical block 4, async page read May 12 07:57:24 us64a kernel: [69801.356122] print_req_error: I/O error, dev loop0, sector 5 May 12 07:57:24 us64a kernel: [69801.356125] Buffer I/O error on dev loop0, logical block 5, async page read May 12 07:57:24 us64a kernel: [69801.356128] print_req_error: I/O error, dev loop0, sector 6 May 12 07:57:24 us64a kernel: [69801.356130] Buffer I/O error on dev loop0, logical block 6, async page read May 12 07:57:24 us64a kernel: [69801.356134] print_req_error: I/O error, dev loop0, sector 7 May 12 07:57:24 us64a kernel: [69801.356136] Buffer I/O error on dev loop0, logical block 7, async page read May 12 07:57:24 us64a kernel: [69801.356260] Buffer I/O error on dev loop0, logical block 0, async page read May 12 07:57:24 us64a kernel: [69801.356263] Buffer I/O error on dev loop0, logical block 1, async page read The command, understandably, reports "can't read superblock on /dev/loop0". The problem happens even on newly created images. Here's a sample set of commands and responses: $ mkfs.msdos -C flop1 1440 $ ls -l -rwxrwxrwx 1 root root 1474560 May 10 18:49 flop1 $ hd flop1 <--- output looks reasonable including 55 aa and two FATs ---> $ sudo mkdir /mnt/flop1 $ sudo mount -o loop flop1 /mnt/flop1 mount: /mnt/flop1: can't read superblock on /dev/loop0. $ losetup -f /dev/loop0 $ I see plenty of reports of similar on different websites but without resolution, including one on Launchpad but where the OP stopped responding so it did not get resolved. I don't know when this problem started to occur on this machine. If it's relevant, this is running under VirtualBox which reports itself as Version 5.2.26 r128414 (Qt5.6.2) with their 'host extensions' enabled. However, mounting a floppy image previously worked on this virtual machine. I have rebooted with /forcefsck to check the root (and only) filesystem. I have upgraded to the latest LTS Ubuntu, as below, but the problem persists. System info: No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.2 LTS Release: 18.04 Codename: bionic Linux us64a 4.18.0-18-generic #19~18.04.1-Ubuntu SMP Fri Apr 5 10:22:13 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux The machine is command-line only, i.e. no windowing. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1828712/+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
