Dependencies problems in downloading and installing packages in Ubuntu 12.04LTS and held broken packages -

i newbie in ubuntu. have installed 12.04 lts in laptop , fine. want install packages wine,vlc,chromium browser,etc getting various error messages,such ,

error 1.package dependencies cannot resolved.

while installing chromium ubuntu software center,

chromium-browser: depends: libgcc1 (>= 1:4.1.1) 1:4.6.3-1ubuntu5 installed depends: libudev0 (>= 147) 175-0ubuntu9.5 installed depends: libx11-6 (>= 2:1.2.99.901) 2:1.4.99.1-0ubuntu2.2 installed depends: libxcomposite1 (>= 1:0.3-1) 1:0.4.3-2build1 installed depends: libxdamage1 (>= 1:1.1) 1:1.1.3-2build1 installed depends: libxi6 (>= 2:1.2.99.4) 2:1.7.1.901-1ubuntu1~precise1 installed depends: libxss1 not going installed depends: zlib1g (>= 1:1.1.4) 1:1.2.3.4.dfsg-3ubuntu4 installed 

while installing vlc,

vlc: depends: vlc-nox (= 2.0.8-0ubuntu0.12.04.1) 2.0.8-0ubuntu0.12.04.1 installed      depends: libavcodec-extra-53 (>= 4:0.8-1~) 4:0.8.12ubuntu0.12.04.1 installed      depends: libavutil-extra-51 (>= 4:0.8-1~) 4:0.8.12ubuntu0.12.04.1 installed      depends: libc6 (>= 2.15) 2.15-0ubuntu10.5 installed      depends: libfreetype6 (>= 2.2.1) 2.4.8-1ubuntu2.1 installed      depends: libgcc1 (>= 1:4.1.1) 1:4.6.3-1ubuntu5 installed      depends: libqtcore4 (>= 4:4.8.0) 4:4.8.1-0ubuntu4.8 installed      depends: libqtgui4 (>= 4:4.7.0~beta1) 4:4.8.1-0ubuntu4.8 installed      depends: libstdc++6 (>= 4.6) 4.6.3-1ubuntu5 installed      depends: libva-x11-1 (> 1.0.15~) not going installed      depends: libva1 (> 1.0.15~) not going installed      depends: zlib1g (>= 1:1.2.3.3.dfsg) 1:1.2.3.4.dfsg-3ubuntu4 installed 

while installing cheese camera booth ,

cheese: depends: libclutter-gtk-1.0-0 (>= 0.91.8) not going installed         depends: cheese-common (= 3.4.1-0ubuntu2.1) 3.4.1-0ubuntu2.1 installed 

error 2.unable correct problems , have held broken packages.

i need solution install applications , packages , fixing all.

i have tried for,

sudo apt-get remove libapache2-mod-wsgi sudo apt-get clean sudo apt-get autoclean   sudo apt-get update sudo apt-get install libapache2-mod-wsgi 

error 3: unable fetch archives, may run apt-get update or try --missing?

this error shows while running , executing sudo apt-get update of no use. please me out .. or should go removing or changing ubuntu version other if please mention.

thanks

i think should

first downgrade required , done following: create 'preferences' file:

sudo vi /etc/apt/preferences 

and insert following lines:

package: *        pin: release a=precise* pin-priority: 2012 

pin-priority must greater 1000.

then may downgrade offending applications with:

sudo apt-get dist-upgrade  may install packages complained dependencies, sudo apt-get install ia32-libs-multiarch, or sudo apt-get install ia32-libs. 

finally, should remove file created:

sudo rm /etc/apt/preferences 

now install prefer package