Linux

29 May

change panel’s layer in LXQT

The previous article (lubuntu’s panel keeps in top of all windows) explains how to restrain LXDE’s panel in the bottom layer by editing lxde-rc.xml. A similar method is available in LXQT. The only difference is the ‘name’ property of the ‘application’ tag.

Comment information at the start of application part explained how to find applications’ name property. You can get a window’s properties by running xprop, the first element of window’s WM_CLASS property is what you need. As for panels in LXQT this value is ‘lxqt-panel’. So the entire config information is as follows:


<application name="lxqt-panel" >
<layer>below</layer>
</application>

25 Dec

LXDE: desktop manager is not active

I’ve got some memory-intensive works to do recently. So I managed to log in to lxde desktop again last night after repairing a long-pending black screen problem by just uninstalling Nvidia driver.

However, I came up with a new problem this morning. After I set wallpaper on an external monitor, the desktop-preference program crashed by reporting "desktop manager is not active" and I got a wrongly configured wallpaper as an accompanying result. The link here said that this is because the pcmanfm failed to draw desktop at startup. Manually redraw desktop by executing:
pcmanfm --desktop &
will restore desktop-preference. I planned to add this command to autostart menu and found that there was already a similar command:
pcmanfm --desktop --profile LXDE
Obviously, this is the failed command which caused the trouble. It seems that an LXDE profile config file related to this command was corrupted.
I finally found this desktop-items-0.conf file under /home/user/.config/pcmanfm/LXDE and modified the wallpaper related settings in it to default. To be specific:

wallpaper_mode=crop
wallpaper=/usr/share/backgrounds/images/default.png

Actually, I copied these 2 lines from a desktop-items-1.conf file in the same folder.

15 Oct

Memory problem of VMPlayer14 on Fedora26

Upgraded My Fedora to 26 today and found my VMplaye-12.5.7 can not be started on Fedora 26. So I reinstalled vmplayer with version 14. VMplayer14 started properly, but when I started a VM, an error occurred as

” The virtual machine is unable to reserve memory“.

I tried several times, it reported either

” The virtual machine is unable to reserve memory” or “Not enough physical memory is available to power on this virtual machine”.

The vm’s memory is 1G, and I still have more than 4G free memory at the moment, so it can’t be the shortage of the memory that causes the problem. I searched for a while and found the solution here: https://communities.vmware.com/thread/573966

What is needed is the vmware-host-module patch from GitHub. Download the correct branch which corresponds to the vmware version, that is player-14.0.0 in my case, and do the following operations :

tar -cf vmmon.tar vmmon-only/

tar -cf vmnet.tar vmnet-only/

cp *.tar /usr/lib/vmware/modules/source/

Then remove the .ko files from /lib/modules/$(uname -r)/misc.

now do

vmware-modconfig –install-all

Then I rebooted the system and tried to run VMplayer again, everything went ok now.

7 Aug

Disable touchpad in fedora25-lxde

As synaptics is no longer available for controlling touchpad, we have to use xinput instead.
First, use command : xinput list to display all input devices and find out touchpad’s number.
In my system the result is:

⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech M215 2nd Gen id=10 [slave pointer (2)]
⎜ ↳ Logitech M280/320/275 id=11 [slave pointer (2)]
⎜ ↳ Logitech M280/320/275 id=12 [slave pointer (2)]
⎜ ↳ Logitech M280/320/275 id=13 [slave pointer (2)]
⎜ ↳ Logitech M280/320/275 id=14 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=17 [slave pointer (2)]
⎜ ↳ TPPS/2 IBM TrackPoint id=18 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Power Button id=9 [slave keyboard (3)]
↳ Integrated Camera id=15 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=16 [slave keyboard (3)]
↳ ThinkPad Extra Buttons id=19 [slave keyboard (3)]

As displayed, my touchpad’s id number is 17. Next, just disable it using the following command:
xinput --disable 17

6 Aug

Ibus not work in LXDE-Fedora

search result talks about an “input method selector” in preference menu which was not found on my system.
solution:
sudo dnf install imsettings-lxde

then you can find “input method selector” in preference menu.

14 Jul

Fedora network icon disappeared

I created a fedora VM on Lubuntu host this afternoon. When I reopen it tonight, I found the network icon on the top-right disappeared and the network function failed too. I tried some solutions on the forum but nothing helped. Therefore I stopped to do something else. When I came back to VMplayer and tried to open the VM file again, I found that there was my “Fedora” folder along with an empty “fedora” folder under the same path, so I think it maybe the duplicated file name which played the trick. I deleted the empty file and opened the VM again, Now the problem is gone.

28 Dec

lubuntu’s panel keeps in top of all windows

I want the panel to stay in the back of other windows instead of hiding. There is such an option in the panel settings but seems not to be working.
I managed to do that by editing /home/me/.config/openbox/lubuntu-rc.xml
Add these lines just before the last line:

<application name="panel">
<skip_taskbar>yes</skip_taskbar>
<layer>above</layer>
</application>
<application name="panel" type="dock">
<layer>below</layer>
</application>
</applications>

Then restart lubuntu

27 Dec

Ubuntu： incorrect Chinese display

Ubuntu 16.04：Chinese characters display improperly. Old methods don’t work. We need some new methods.
For the system:
sudo vim /var/lib/locales/supported.d/zh-hans
add:
zh_CN.UTF-8 UTF-8
zh_CN.GB18030 GB18030
zh_CN.GBK GBK
zh_CN GB2312
zh_HK.UTF-8 UTF-8
zh_HK BIG5-HKSCS
zh_SG.UTF-8 UTF-8
zh_SG.GBK GBK
zh_SG GB2312
zh_TW.UTF-8 UTF-8
zh_TW.EUC-TW EUC-TW
zh_TW BIG5
to the file
(those lines were copied from /usr/share/i18n/SUPPORTED)

excecute：
sudo locale-gen

next： config vim：
sudo vi /etc/vim/vimrc
add：
let &termencoding=&encoding
set fileencodings=utf-8,gb18030,gbk,gb2312,big5

next: config gedit:
dconf-editor
in the tree, find:org/gnome/gedit/preferences/encodings
edit the value of candidate-encodings as [‘UTF-8’, ‘GB18030’, ‘GB2312’, ‘GBK’, ‘BIG5’, ‘CURRENT’, ‘UTF-16’]

13 Dec

Ubuntu booted into emergency mode

I booted my system this morning and found it was forced into an emergency mode like this:

img_20161214_082619

I found an answer on askubuntu.com which talked about unmounting some device. This remind me of what I did last night. I configured my /etc/fstab file last night to add windows partitions’ infomations there, as well as a Seagate portable disk. But now I am in my office without that Seagate disk. Could it be the missing device that caused the booting problem?

So I booted into a live USB to comment out the Seagate device information in fstab file and reboot the computer again. Now I can boot into my system without any problem!

5 Nov

500 internal server error on visiting encrypted path

I use .htaccess to encrypt “www.actinia.me/test”

the .htaccess file is:

AuthUserFile /home/.htpasswd
AuthName “ceshiyonghu”
AuthType Basic
Require user ceshiyonghu

but when I visited the url, I got a 500 internal server error. I checked the error log (/var/log/apache2/error.log) and find the “AuthUserFile not allowed here” record.

To solve this, I added this:

<Directory /var/www/test/>
Options Indexes FollowSymLinks MultiViews
AllowOverride FileInfo Indexes Authconfig
</Directory>

to apache config file (/etc/apache2/apache2.conf),

and executed:

sudo a2enmod rewrite

sudo service apache2 restart

Now I can visit my test folder!