Thanks for your report.
The upgrader fails to calculate the upgrade because you have non-
official versions of libstdc++6 and gcc-4.9 installed on your system.
These packages cannot be upgraded and hold back several dependant
packages like libqt5core.
Here is the relevant part of the log
809 Investigating (0) libstdc++6 [ amd64 ] < 4.9-20140218-1 > ( libs )
810 Broken libstdc++6:amd64 Depends on gcc-4.9-base [ amd64 ] < 4.9-20140218-1
-> 4.9-20140406-0ubuntu1 > ( libs ) (= 4.9-20140218-1)
811 Considering gcc-4.9-base:amd64 806 as a solution to libstdc++6:amd64 2272
812 Added gcc-4.9-base:amd64 to the remove list
813 Fixing libstdc++6:amd64 via keep of gcc-4.9-base:amd64
814 MarkKeep gcc-4.9-base [ amd64 ] < 4.9-20140218-1 ->
4.9-20140406-0ubuntu1 > ( libs ) FU=0
815 Try to Re-Instate (0) gcc-4.9-base:amd64
816 MarkKeep gcc-4.9-base [ amd64 ] < 4.9-20140218-1 ->
4.9-20140406-0ubuntu1 > ( libs ) FU=0
817 Investigating (0) gcc-4.9-base [ amd64 ] < 4.9-20140218-1 ->
4.9-20140406-0ubuntu1 > ( libs )
818 Broken gcc-4.9-base:amd64 Breaks on gcc-4.9-base [ i386 ] < none ->
4.9-20140406-0ubuntu1 > ( libs ) (!= 4.9-20140218-1)
819 Considering gcc-4.9-base:i386 9 as a solution to gcc-4.9-base:amd64 806
820 Added gcc-4.9-base:i386 to the remove list
821 Fixing gcc-4.9-base:amd64 via keep of gcc-4.9-base:i386
822 MarkKeep gcc-4.9-base [ i386 ] < none -> 4.9-20140406-0ubuntu1 > ( libs
) FU=0
865 Investigating (0) libgcc1 [ i386 ] < 1:4.8.1-10ubuntu9 ->
1:4.9-20140406-0ubuntu1 > ( libs )
866 Broken libgcc1:i386 Depends on gcc-4.9-base [ i386 ] < none ->
4.9-20140406-0ubuntu1 > ( libs ) (= 4.9-20140406-0ubuntu1)
867 Considering gcc-4.9-base:i386 9 as a solution to libgcc1:i386 12
868 MarkKeep libgcc1 [ i386 ] < 1:4.8.1-10ubuntu9 -> 1:4.9-20140406-0ubuntu1
> ( libs ) FU=0
869 Removing libgcc1:i386 rather than change gcc-4.9-base:i386
870 MarkDelete libgcc1 [ i386 ] < 1:4.8.1-10ubuntu9 ->
1:4.9-20140406-0ubuntu1 > ( libs ) FU=0
969 Investigating (1) libgcc1 [ amd64 ] < 1:4.8.1-10ubuntu9 ->
1:4.9-20140406-0ubuntu1 > ( libs )
970 Broken libgcc1:amd64 Depends on gcc-4.9-base [ amd64 ] < 4.9-20140218-1 ->
4.9-20140406-0ubuntu1 > ( libs ) (= 4.9-20140406-0ubuntu1)
971 Considering gcc-4.9-base:amd64 806 as a solution to libgcc1:amd64 3979
972 MarkKeep libgcc1 [ amd64 ] < 1:4.8.1-10ubuntu9 ->
1:4.9-20140406-0ubuntu1 > ( libs ) FU=0
973 Removing libgcc1:amd64 rather than change gcc-4.9-base:amd64
974 MarkDelete libgcc1 [ amd64 ] < 1:4.8.1-10ubuntu9 ->
1:4.9-20140406-0ubuntu1 > ( libs ) FU=0
1017 Broken libqt5core5a:amd64 Depends on libgcc1 [ amd64 ] < 1:4.8.1-10ubuntu9
-> 1:4.9-20140406-0ubuntu1 > ( libs ) (>= 1:4.1.1)
1018 Considering libgcc1:amd64 3979 as a solution to libqt5core5a:amd64 200
1019 MarkKeep libqt5core5a [ amd64 ] < none -> 5.2.1+dfsg-1ubuntu14 > ( libs
) FU=0
1020 Holding Back libqt5core5a:amd64 rather than change libgcc1:amd64
The following packages are not from Ubuntu:
cpp-4.9 4.9-20140218-1 0
gcc-4.9-base 4.9-20140218-1 0
libasan1 4.9-20140218-1 0
libatomic1 4.9-20140218-1 0
libcilkrts5 4.9-20140218-1 0
libgomp1 4.9-20140218-1 0
libitm1 4.9-20140218-1 0
liblsan0 4.9-20140218-1 0
libquadmath0 4.9-20140218-1 0
libstdc++6 4.9-20140218-1 0
libtsan0 4.9-20140218-1 0
libubsan0 4.9-20140218-1 0
libvtv0 4.9-20140218-1 0
Please revert them to the versions from an official Ubuntu repository
and try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1310325
Title:
Upgrade from 13.10 to 14.04 fails (unable to calculate upgrade)
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