Downloading Linux x64 Dart SDK from Flutter engine 26b23d88f9151815d5e95aedd0338e5ffb74c326...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  4  203M    4 9039k    0     0  60.0M      0  0:00:03 --:--:--  0:00:03 59.6M
 79  203M   79  161M    0     0   140M      0  0:00:01  0:00:01 --:--:--  140M
100  203M  100  203M    0     0   143M      0  0:00:01  0:00:01 --:--:--  143M
Building flutter tool...
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (8 tries left)
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (7 tries left)
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (6 tries left)
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (5 tries left)
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (4 tries left)
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (3 tries left)
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (2 tries left)
Resolving dependencies...
Because no versions of macros match >=0.1.1-main.0 <0.1.1-main.0 and analyzer >=6.5.1 <6.5.2 depends on macros >=0.1.1-main.0 <0.1.2, analyzer >=6.5.1 <6.5.2 requires macros >=0.1.1-main.0 <0.1.2.
And because macros >=0.1.1-main.0 <0.1.2-main.0 depends on _macros 0.2.0 from sdk, analyzer >=6.5.1 <6.5.2 requires _macros 0.2.0 from sdk.
So, because no versions of _macros from sdk match 0.2.0 and flutter_tools depends on analyzer 6.5.1, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Try an upgrade of your constraints: dart pub upgrade --major-versions
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (1 tries left)
Command 'pub upgrade' still failed after 10 tries, giving up.