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Paul O'Rorke's questions

Martin Hope
Paul O'Rorke
Asked: 2022-04-28 12:42:10 +0800 CST
  • 0

for months now I've been doing physical backup from an Ubuntu Server 20.04 to USB drives I swap out and take off site. No rocket science, I plug in the drive, mount the block device, typically /dev/sdb1 and I'm off.

The drives have NTFS partitions, and are 4GB in size. Now since yesterday and some routine updates neither of my two identical USB drives will get a block device created on plugging it in to the Linux host. Both show up fine in Windoze. I went so far as to reformat one, both gain as NTFS and once as xfat. Neither action resulted in any changed behaviour when plugging it into the Ubuntu host.

The block device /dev/sdb eventually show up after plugging it in - but only after a very long time.

# file /dev/sdb
/dev/sdb: block special (8/16)

but I fdisk can't "see" it:

# fdisk /dev/sdb

Welcome to fdisk (util-linux 2.34).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

fdisk: cannot open /dev/sdb: No such file or directory

Nothing shows with lsblk or blkid I guess since the block device is never created.

Any suggestions what to try to get this working again?

usb
Martin Hope
Paul O'Rorke
Asked: 2018-08-10 16:32:02 +0800 CST
  • 3

I have set up sssd and joined my 18.04 LTS workstation to the company domain. Most things work OK except for a couple of snap applications. When trying to run them I get errors creating files in ~/snap.

:~$ skype cannot create user data directory: /home/[domain]/[user]/snap/skype/48: Permission denied

Skype works if I run it as root, however I would prefer not to do that.

The mail app hiri however refuses to let me write in it even if I club it with chmod -R 777

~$ hiri cannot create user data directory: /home/[domain]/[user]/snap/hiri/55: Permission denied

What am I missing?

permissions skype snap sssd
Martin Hope
Paul O'Rorke
Asked: 2018-06-14 12:21:15 +0800 CST
  • 4

I have recently set up a Windows AD domain controller with DNS and DHCP servers. Windows clients get their DNS server set to match what DHCP hands out but my Ubuntu 16.04 workstation only sets the loopback address and a search domain:

I had expected to see the setting nameserver 192.168.14.4 in /etc/resolveconf

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
search pdf-xchange.net

If I add dns-nameservers 192.168.14.4 to /etc/network/interfaces , i see it in /etc/resolv.conf but i want some Ubuntu Desktops to use DHCP and not have to manually modify them.

Why does a DHCP client not add the DNS nameserver the way a static entry in /etc/network/interfaces does ? I want this set as it is specified as a prerequisite for adding the machine to the AD domain:

The domain controller is the primary DNS resolver as specified in /etc/resolv.conf.

https://help.ubuntu.com/lts/serverguide/sssd-ad.html.en-GB#sssd-ad-requirements

networking dns dhcp