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Anything about Ubuntu, Centos, openSuSe and Fedora
Some update and upgrade session might corrupt the metadata of the package information in Ubuntu, more known as the “Hash Sum mismatch” error after the apt-get update command. A workaround if the simple update command doesn’t work is you need to manually clean the package metadata record being produced, here’s how:
apt-get clean rm -rf /var/cache/apt/* rm -rf /var/lib/apt/lists/*
Full information about the discussion here: (https://gitlab.com/gitlab-org/omnibus-gitlab/issues/628)
Since I recently got my new Lenovo G5070 notebook few days ago, I rush in to install second OS : Ubuntu 14.04, though installation process is tough, need to fix video card defaults, from fgrlx to intel graphics. Then another issue is wireless network RTL8723BE drops after each connection, but this article is about the touchpad: the ElanTech Touchpad, which by default not functioning well. Issues like there’s no switch off touchpad option in Ubuntu settings, multi-touch is not working, neither the scrolling.
Now to fix this issues, here’s the guide:
1. First, download the patch for the touchpad here.
2. Install dkms (if you haven’t done it yet)
sudo apt-get install dkms
3. Go to the directory where you store the file and perform the following:
sudo dkms ldtarball psmouse-elantech-x551c.tar.gz sudo dkms install -m psmouse -v elantech-x551c
4. Then reconfigure the driver
sudo rmmod psmouse sudo modprobe psmouse sudo update-initramfs -u -k all
After a clean install or upgrade from 12.04 to 14.04 on raid or lvm setup, normally you will encounter this error, which is related to the setup I mentioned. From various test, I encounter a workaround to fix this error.
Replace quick_boot=1 with quick_boot=0
Still using Ubuntu 12.04, and one of the problem we’ve encountered is it requires normal user to authenticated the designated admin user’s password when connecting to wireless network, which in my opinion doesn’t make sense. How can a normal user access internet over wifi if they aren’t allowed to do so?
Check what google search has to offer, I finally found a fix for this. Adding policykit rules for wifi users.
Create or modify a file etc/polkit-1/localauthority/50-local.d/52-wifi-management.pkla
$> sudo gedit etc/polkit-1/localauthority/50-local.d/52-wifi-management.pkla
and then enter the following
[Wifi management] Identity=unix-group:netdev Action=org.freedesktop.NetworkManager.* ResultAny=no ResultInactive=no ResultActive=yes
and save on exit.
Add the user to the netdev group
$> sudo usermod -a -G ftp jerry
Restart the system and standard user should now be able to connect to wifi..
On the current version of Ubuntu (12.04), you might notice that the current /etc/resolv.conf file always record a nameserver 127.0.0.1 which then resolv dns via dnsmasq, but most of the time after test few things, I found it more problematic. It always disregard my local DNS server, and goes directly to the DNS of my ISP.
If you’re having the same problem like mine, here’s a quickfix:
1. Modify the configuration /etc/NetworkManager/NetworkManager.conf
$> sudo gedit /etc/NetworkManager/NetworkManager.conf
2. Comment the line that contain “dns=dnsmasq”
[main] ... #dns-masq
3. Then restart the network-manager
$> sudo service network-manager restart
UPDATE(07/29/2011): The GRUB thing didn’t work at all, back to basic trapping signal via upstart scripts in /etc/init/dbus.conf. I tried it before using /etc/init/network-manager.conf but on Ubuntu 10.10, it’s not working anymore. Here’s another test and works for me.
1. Modify the current /etc/init/dbus.conf.
$> sudo vi /etc/init/dbus.conf
2. Add a pre-stop script, which looks like this:
pre-stop script trap "TERM signal" TERM /bin/umount -a -t cifs -l -f trap - TERM end script
3. Save the script and have a test.
UPDATE(07/28/2011): Found a better alternative via GRUB, link here. Mainly you just need to modify the /etc/default/grub. Here’s the details: 1. Edit the /etc/default/grub
$> sudo vi /etc/default/grub
2. Add “reboot=pci” on the GRUB_CMDLINE_LINUX line, it should look something like this:
... GRUB_CMDLINE_LINUX="reboot=pci" ...
3. Update the grub
$> sudo update-grub
It’s an ancient bug (here), which still exist in Ubuntu 11.04, or even in other distros. When you got a mounted samba shares before the shutdown or restart process, the machine waits for around 10 minutes before it complete the operation. Very troublesome that’s why I tried various workaround but none of them works with Ubuntu 11.04. Not even the /etc/rc6.d/K* or the upstart /etc/init configurations, nor the old python script I posted before (here’s the link).
After few considerations, I made a desperate workaround, creating a script that triggers before the /sbin/shutdown, /sbin/reboot and /sbin/restart commands.
1. Rename the current shutdown, reboot and restart commands in /sbin.
#> mv /sbin/shutdown /sbin/shutdown2 #> mv /sbin/reboot /sbin/reboot2 #> mv /sbin/restart /sbin/restart2
2. Then create scripts with names of the previous commands in /sbin, which contains the following:
#!/bin/sh umount -t cifs -a -f -l /sbin/shutdown2 $@ exit 0
3. Make similar script for reboot and restart command which also points to /sbin/reboot2 and /sbin/restart2.
4. Until the dbus implementation of stop on deconfiguring-networking comes to Ubuntu 11.04, which I think working with
Ubuntu 11.10 oneiric. I think this is the least workaround that works for me.
After modifying your workstation authentication and adds optional LDAP or KERBEROS authentication, you end up messing your pam configurations. Here’s a quick fix that works for me:
$ sudo pam-auth-update --force
I hope it works in your case too.
This guide will help to install and configure a SAMBA Windows File Server that acts as a PDC using tbsam, Although it is suggested to have it configured with LDAP authtentication backend, many small office still cater this kind of configuration.
Here’s the details:
1. Install the Samba File Server and necessary packages.
#> yum groupinstall "Windows File Server"
2. Prepare the necessary directories needed for netlogon.
#> mkdir -p /home/samba/netlogon
3. For new users to have a directory called profile in their home directory, add a folder called “profiles” in the /etc/skel. For existing users, just add the folder “profiles” to their home directories and change the ownership to their corresponding owners.
4. Backup the existing /etc/samba/smb.conf file first before using the configuration below:
[global] #Server Declaration workgroup = MYDOMAIN netbios name = FILESERVER001 server string = File Server %v #Security Properties security = user domain master = yes preferred master = yes local master = yes domain logons = yes wins support = yes os level = 65 name resolve order = wins bcast hosts #Login Configurations logon path = \\%L\%U\profiles logon drive = H: logon home = \\%L\%U logon script = logon.bat #User Scripts add group script = /usr/sbin/groupadd '%g' delete group script = /usr/sbin/groupdel '%g' add user to group script = /usr/sbin/usermod -a -G '%g' '%u' delete user from group script = /usr/bin/gpasswd -d '%u' '%g' add user script = /usr/sbin/useradd -m -G users '%u' add machine script = /usr/sbin/useradd -s /bin/false -d /tmp '%u' delete user script = /usr/sbin/userdel -r '%u' idmap uid = 1000 - 20000 idmap gid = 1000 - 20000 #Passwords passdb backend = tdbsam:/etc/samba/passdb.tdb passwd program = /usr/bin/passwd '%u' passwd chat = "*Enter\snew\sUnix\spassword:*" %n\n "*retype\snew\sUnix\spassword:" %n\n. "*updated successfuly*" passwd chat debug = yes encrypt passwords = yes unix password sync = yes enable privileges = yes username map = /etc/samba/smbusers # Log File log file = /var/log/samba/%m.log log level = 3 max log size = 50 #Other Configurations socket options = TCP_NODELAY IPTOS_LOWDELAY SO_SNDBUF=8192 SO_RCVBUF=8192 printing = cups printcap name = cups show add printer wizard = No #============================ Share Definitions ============================== [netlogon] path = /home/samba/netlogon admin users = root guest ok = yes browsable = no valid users = %U read only = no admin users = Administrator [profiles] path = /home/%U/profiles create mode = 0600 directory mode = 0700 profile acls = Yes read only = No [homes] comment = Home Directories browseable = no writeable = yes valid users = %S create mode = 777 directory mode = 777 [printers] comment = All Printers path = /var/spool/samba browseable = no guest ok = no writable = no printable = yes
5. Modify the /etc/nsswitch.conf, your hosts line should look like this:
hosts: files wins dns
6. Modify the /etc/samba/smbusers, the root usermap should look like this:
root = administrator Administrator admin
7. Link SAMBA and Linux user groups, from root access, execute the following commands:
#> net groupmap add ntgroup="Domain Admins" unixgroup=root rid=512 type=d #> net groupmap add ntgroup="Domain Users" unixgroup=users rid=513 type=d #> net groupmap add ntgroup="Domain Guests" unixgroup=nobody rid=514 type=d
After each commands, the system should response with the following message.
Successfully added group Domain ... to the mapping db as a domain group
8. To additional groups, perform the following:
#> groupadd <linux group> #> net groupmap add ntgroup="<windows group>" unixgroup=<linux group> type=d
Note: the rid value should be the succeeding number of the previously entered value.
9. Add root to the samba users, to be used in domain authentication on windows workstations.
#> smbpasswd -a root #> smbpasswd -e root
10. Check your configurations and verify that you have entered the correct settings.
11.Restart the samba service, also start the winbind service it not yet running.
#> service smb restart #> service winbind start
12. Test the Administrator access first
#> smbclient -L localhost -U enter the root password
12. To add new users, you can use the basic commands:
#> useradd -m -G users <username> #> passwd <username> #> smbpasswd -a <username>
Also note that new users and groups should be in range from 1000 to 20000, else modify the idmap declarations in /etc/samba/smb.conf.
13. Restart the samba service again, and check of the new user will be authenticated when accessing the samba shares.
$> smbclient -L localhost -U <username> enter the <username's> password
14. Configure the windows workstation and join them to your new samba file server using the details below:
Domainname: MYDOMAIN Administrator Account: Administrator Password: <your root password>
As of Ubuntu 10.10, I find network-manager problematic, since it alters the static IP address you’ve configured in /etc/network/interfaces. This is even though you successfully configured the static IP address and stuff. Network-Manager still override them with and use the IP the DHCP had given.
So for now my only fix is to uninstall network-manager and packages related to it.
#> sudo apt-get purge network-manager network-manager-gnome
After this, the static IP address configured in /etc/network/interfaces will be working fine.
After establishing my KVM host from other machine, now it’s the time you need to configure your remote kvm guest manager, if you prefer the GUI management. Here’s the quickest way to do:
$> sudo apt-get install ubuntu-virt-mgmt