如何解決 “Enter password to unlock your login keyring”

在Ubuntu中修改密碼後，每次登入都會出現“Enter password to unlock your login keyring”，根據 [1] 所言，其密碼管理系統由另一個套件所管理，但修改登入密碼時，套件中的密碼不會對應修改。
所以也要一起更改，才不會出現此訊息。

Reference:
[1] How to get rid of “Enter password to unlock your login keyring” in Linux Mint Debian Edition (LMDE) | Black God
http://karuppuswamy.com/wordpress/2011/10/24/how-to-get-rid-of-%E2%80%9Center-password-to-unlock-your-login-keyring%E2%80%9D-in-linux-mint-debian-edition-lmde/

變更ubuntu加密系統之密碼

[encrypted device]: for example /dev/sda#
step. 1. 看有那些解密碼 (似乎可以多重密碼解鎖，未測試。)

sudo cryptsetup luksDump [encrypted device]

step. 2. 加新的密碼，會先要求輸入舊的密碼，才能新增新密碼。完成後若重複step1，可看見二組解密碼。

sudo cryptsetup luksAddKey [encrypted device]

step. 3. 移除舊的密碼，。密碼依加入順序以0-index排序。一般情況而言，舊密碼排序號為 0, 新密碼為 1, 下列指令中的 0，代表刪除舊有密碼，會要求輸入新的密碼(待刪密碼之外的密碼)，才能刪除，完成後若重複step1，可看見只剩下一組密碼。

sudo cryptsetup luksKillSlot [encrypted device] 0

Reference:
[1]  Change password for encrypted filesystem | eazynet.de
http://www.eazynet.de/change_password_for_encrypted_filesystem
[2] [ubuntu] [SOLVED] encrypted filesystem password change? - Ubuntu Forums
http://ubuntuforums.org/showthread.php?t=972122

如何在Ubuntu系統上之Virtualbox 使用USB裝置

For Natty Narwhal (  Ubuntu 11.04 )

Add yourself to the user group vboxusers, then log out and back in, to make use of available USB devices. To do this via the graphical interface, click System Settings/Users and Groups/Manage Groups. 

Reference:
[1] Mount USB Devices in Virtualbox with Ubuntu - How-To Geek
http://www.howtogeek.com/howto/31726/mount-usb-devices-in-virtualbox-with-ubuntu/
[2] VirtualBox/USB - Community Ubuntu Documentation
https://help.ubuntu.com/community/VirtualBox/USB

[Memo] 加密的ubuntu 不能處理長檔名

可能原因：
Linux filenames are limited to 256 characters in length. When using eCryptfs encrypted filenames, filenames are padded with metadata necessary for decryption. Cleartext filenames which are already very long (> ~200 characters) will not work in eCryptfs.

Reference:
[1] EncryptedPrivateDirectory - Community Ubuntu Documentation
https://help.ubuntu.com/community/EncryptedPrivateDirectory

[How to] Move Window Buttons to the Right in Ubuntu 11.04

1. Press Alt+F2
2. type 「gconf-editor」
3. Enter.
-----In editor------
4. Goto 「app -> metacity -> general」
5. Double-click, type 「menu:minimize,maximize,close」

Save&Done!

Reference:
[1]. Move Window Buttons Back to the Right in Ubuntu 10.04 / 10.10 - How-To Geek
http://www.howtogeek.com/howto/13535/move-window-buttons-back-to-the-right-in-ubuntu-10.04/
[2]. Ubuntu 10.4: How to place the window close button on the right again » Codigo Manso
http://www.codigomanso.com/en/2010/04/ubuntu-10-4-poner-el-boton-de-cerrar-la-ventana-a-la-derecha/

[Bug] Ubuntu 11.04 - error : no video mode activated

Case:
Hp mini 110: Install Ubuntu 11.04 alternate with encrypted partition.

[Fail]
Decomment "#GRUB_GFXMODE=640x480" in "/etc/default/grub"

[Success]

Guido Nickels wrote on 2011-05-16: #24

I was finally able to workaround the problem here.
The script /etc/grub.d/00_header does some font path detection stuff and if that fails it doesn't set any gfxmode (neither the default "auto" nor anything defined manually in /etc/default/grub).

The font path is /usr/share/grub, but I have a separate /boot partition and the script doesn't seem to know how to handle this situation correctly, leaving me without fonts and gfxmode.

So, I just copied /usr/share/grub/*.pf2 to /boot/grub and ran update-grub again. Voila, I got my gfxmode and a working unicode font, too.



Reference:
[1] Bug #699802 in grub2 (Ubuntu): “error:: no video mode activated”
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/699802

ubuntu 下查詢硬體資訊的方法

sysinfo
安裝指令：
$sudo apt-get install sysinfo
===================
hardinfo
安裝指令：

$sudo apt-get install hardinfo

===================

$dmidecode
===================
$lshw
===================

$dmesg

===================

查詢 /proc 下的資訊。

===================

參考資訊：
Nothing is everything: 【Ubuntu】硬體檢視軟體
[Ubuntu] hardinfo 硬體資訊 « Wondering @ Wordpress
在Linux底下如何查詢硬體資訊? - IT邦幫忙::IT知識分享社群
Ubuntu常用命令與技巧 - Unix Like - 酷米資訊筆記

於 HP mini 110-1011TU 安裝 gcin 之 嘸蝦米輸入法

預設的安裝移除程式中，沒有gcin可以安裝，
需要先到自訂設定中，啟用終端機選項，在終端機下鍵入：

sudo apt-get install gcin

安裝後，如果不能馬上使用gcin注音輸入法輸入，
可到語言支援中，安裝中文支援即可。

但嘸蝦米需要另外下載表格檔，否則不能使用。
將noseeing.gtab複製到gcin目錄下即可，指令如下：

sudo cp noseeing.gtab /usr/share/gcin/table/

參考來源：
ddy 狡兔三窟之一: ubuntu gcin 嘸蝦米安裝程序 - yam天空部落
GcinInstallBoshiamy - gcin - Trac
[無啥味] noseeing-11

如何變更grub的預設開機系統?

sudo gedit /boot/grub/menu.lst

更改 ##default num 此行下方附近的

default 0 //預設為第一個開機選項

變更成欲設定的開機選項，從0開始計數

ex:

Ubuntu, kernel 2.6.20-15-generic //0
Ubuntu, kernel 2.6.20-15-generic (recovery mode) //1
Ubuntu, memtest86+ //2
Other operating systems: //3
Microsoft Windows XP Home Edition //4

要改成預設Windows XP開機 就改成

default 4

參考來源：

HowtoRestoreGrub
http://wiki.ubuntu-tw.org/index.php?title=HowtoRestoreGrub